Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
dan dung » van dung, tin dung, ap dung
cong tac » cong ty
tac tren » rac tren, tai tren, tap tren
tren tau » tren thuc, tren may, tren dat

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 xanh - ((thanh tung) OR (thanh cong)) dan dung cong tac tren tau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - ((thanh tung) OR (thanh cong)) dan dung cong tac tren tau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - ((thanh tung) OR (thanh cong)) dan dung cong tac tren tau*.