Perhaps you should try some spelling variations:
"thu hoach tuoc toc nguoi" » "thu bach tuoc toc nguoi", "thu hoach toi toc nguoi", "thu hoach tuoc con nguoi", "thu hoach thac toc nguoi"
"tu sach truc tay nguoi" » "tu cach thuc tay nguoi", "tu sach tren tay nguoi", "tu sach thu tay nguoi", "tu sach truc dao nguoi", "tu sach truc may nguoi", "tu sach truc tai nguoi", "tu sach truc thuy nguoi", "thu sach truc tay nguoi", "su sach truc tay nguoi", "te sach truc tay nguoi"
"tu sach duoc tay nguoi" » "tu sach duoc dao nguoi", "tu sach nuoc tay nguoi", "tu sach dao tay nguoi", "tu sach dung tay nguoi", "tu sach duoc tap nguoi", "tu sach duoc thao nguoi", "tu sach toc tay nguoi", "thu sach duoc tay nguoi", "su sach duoc tay nguoi", "te sach duoc tay 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: (("tu sach truc tay nguoi") or ((("thu hoach tuoc toc nguoi") or ("tu sach duoc tay nguoi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("tu sach truc tay nguoi") OR ((("thu hoach tuoc toc nguoi") OR ("tu sach duoc tay nguoi")))).
• Removing quotes may allow a broader search: (( tu sach truc tay nguoi ) or ((( thu hoach tuoc toc nguoi ) or ( tu sach duoc tay nguoi )))).
• Adding a wildcard symbol may retrieve word variants: (("tu sach truc tay nguoi") or ((("thu hoach tuoc toc nguoi") or ("tu sach duoc tay nguoi"))))*.