Perhaps you should try some spelling variations:
dong thanh » truong thanh
hoc thieu » hoc hien
manh cong » manh cuong, hanh cong, manh long
cong thuc » cong tac
thanh van » thanh san, thanh toan, thanh phan
thuc dan » thuc hanh, hoc dan, thuc vat
dan dong » van dong, dan dung, dao dong

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) or (toc thieu)) sang - manh cong thuc dan dong thanh van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) sang - manh cong thuc dan dong thanh van ban*.