Perhaps you should try some spelling variations:
hoc thieu » hoc hien
cong tan » cong tac, cong san, cong thanh
van lang » van nang, va lang, van hang
lang dan » lang van, tang dan, dang dan
dan phan » doan phan, dan chan, van phan
phan lap » phan dau
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) or (toc thieu)) xanh - thanh cong tan van lang dan phan lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (toc thieu)) xanh - thanh cong tan van lang dan phan lap*.