Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
cong thanh » dong thanh, cong trinh, cong tan
hoc thieu » toc thieu, hoc hien
thanh van » thanh san, thanh toan, thanh phan
hang tai » hang va, dung tai
cong san » cong tac
hang ca » hang va, nang cao, hang dau

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 - hanh ((hang ca) or (hang tai)) nhung ((cong thanh) or (cong san)) thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((hang ca) OR (hang tai)) nhung ((cong thanh) OR (cong san)) thanh van.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((hang ca) or (hang tai)) nhung ((cong thanh) or (cong san)) thanh van*.