Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
thong cung » thong cong, thong dung, thong vung
hoc thieu » toc thieu, hoc hien
tac thong » tac thuong, tac trong, tac chong
cong tac » cong ty
cung bai » cuong bai, dung bai, nhung bai
bai toan » bai tap
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chieu) or (hoc thieu)) sach - thanh cong tac thong cung bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (hoc thieu)) sach - thanh cong tac thong cung bai toan cau.
• Adding a wildcard symbol may retrieve word variants: ((theo chieu) or (hoc thieu)) sach - thanh cong tac thong cung bai toan cau*.