Perhaps you should try some spelling variations:
thieu sach » chieu sach, thien hach, hieu cach
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
trong ca » trong cac, trong nha
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap
tang ca » tang cua, tang ma, tang ha
hang ca » hang va, nang cao, hang tai

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 ((trong ca) or (((tang ca) or (hang ca)))) thong cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sach - hanh ((trong ca) OR (((tang ca) OR (hang ca)))) thong cong tan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sach - hanh ((trong ca) or (((tang ca) or (hang ca)))) thong cong tan than cau*.