Perhaps you should try some spelling variations:
doc hieu » hoc thieu, hoc hien
canh dan » canh van, sanh dan, thanh dan
phi cong » thi cong, phan cong, pham cong
cong tap » cuong tap, cong tac, cong tan
tap hoa » tap hop, tap doan, tap toan
dan va » doan va, dan ca, ban va
va phi » va chi, va phe, va pha

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (toc thieu)) lang - canh dan va phi cong tap hoa co~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) lang - canh dan va phi cong tap hoa co*.