Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
hang cong » dang cong, hang nong, bang cong
cong tan » cong tac, cong san, cong thanh
tan van » tran van, tang van, luan van

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 hach - hanh ((trung cua) or (trung cap)) hang cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - hanh ((trung cua) OR (trung cap)) hang cong tan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - hanh ((trung cua) or (trung cap)) hang cong tan van ban*.