Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
canh trinh » canh tranh, hanh trinh, canh tinh
thanh chau » thanh cha, thanh cham, thanh chu
hoc thieu » toc thieu, hoc hien
trinh vat » trinh van, trinh luat, sinh vat
dang cong » dung cong
vat dang » van dang, vat dung, va dang
cong tan » cong tac, cong san, cong thanh
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: hoc thieu sach - canh trinh vat dang cong tan ((thanh chau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - canh trinh vat dang cong tan ((thanh chau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - canh trinh vat dang cong tan ((thanh chau) or (toan cau))*.