Perhaps you should try some spelling variations:
"thu hoach hoc tac nguoi" » "thu hoach hoi tac nguoi", "thu hoach hoa tac nguoi", "thu hoa hoc tac nguoi", "thu hoach hoc toc nguoi", "thu hoach hoc tay nguoi", "thu hoach hoc thuc nguoi", "thu hoach hoc tach nguoi", "thu hoach hoc tap nguoi", "thu hoach hoc cac nguoi"
"so cach thoi gian nguoi" » "so cac thoi gian nguoi", "so cach thuc gian nguoi", "so cach noi gian nguoi", "so sach thoi gian nguoi", "loi cach thoi gian nguoi", "mot cach thoi gian nguoi", "so cach thoi giao nguoi", "so cach thoi gia nguoi"
"co cach hoc cao nguoi" » "co cach hoc cho nguoi", "co cach hoc dao nguoi", "co cach hoc ca nguoi", "co cach thuc cao nguoi", "co dich hoc cao nguoi", "co cac hop cao nguoi", "co cac hoc cao nguoi", "co sach hoc cao nguoi", "ca cach hoc cao nguoi"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("thu hoach hoc tac nguoi") or ((("so cach thoi gian nguoi") or ("co cach hoc cao nguoi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("thu hoach hoc tac nguoi") OR ((("so cach thoi gian nguoi") OR ("co cach hoc cao nguoi")))).
• Removing quotes may allow a broader search: (( thu hoach hoc tac nguoi ) or ((( so cach thoi gian nguoi ) or ( co cach hoc cao nguoi )))).
• Adding a wildcard symbol may retrieve word variants: (("thu hoach hoc tac nguoi") or ((("so cach thoi gian nguoi") or ("co cach hoc cao nguoi"))))*.