Perhaps you should try some spelling variations:
thieu hach » thien hach, chieu sach, hieu cach
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
vat dung » va dung, viet dung, mat duong
van dung » van dong, xay dung, tin dung
cong ban » cong bang, cong san, cong tan
ban thi » dan thi, van thi, can thi
thi cao » thai cao, thi hao, thi bao

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 - thanh tung ((vat dung) or (van dung)) cong ban thi cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hach - thanh tung ((vat dung) OR (van dung)) cong ban thi cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu hach - thanh tung ((vat dung) or (van dung)) cong ban thi cao*.