Perhaps you should try some spelling variations:
hanh dung » thanh dung, anh dung, hanh dong
dong cong » duong cong, dung cong, cong cong
dang cong » dung cong
thi hieu » thi chieu, thi hien, thi dieu
theo chu » theo chieu, cho chu, chao chu
san than » sang than, san thanh, ban than
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thi hieu) or (theo chu)) xanh - hanh dung cho ((dong cong) OR (dang cong)) san than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thi hieu) OR (theo chu)) xanh - hanh dung cho ((dong cong) OR (dang cong)) san than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thi hieu) or (theo chu)) xanh - hanh dung cho ((dong cong) OR (dang cong)) san than tap".
• Adding a wildcard symbol may retrieve word variants: ((thi hieu) or (theo chu)) xanh - hanh dung cho ((dong cong) OR (dang cong)) san than tap*.