Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
manh trung » manh tung, thanh trung, manh hung
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
cong tan » cong tac, cong san, cong thanh
than cao » toan cao, than cap, than sao
thai cao » tai cao, thoai cac, thuat cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sach - manh trung cua thong cong tan ((than cao) or (thai cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - manh trung cua thong cong tan ((than cao) OR (thai cao)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - manh trung cua thong cong tan ((than cao) or (thai cao))*.