Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
hanh trang » thanh trung, canh tranh, hanh trinh
thong cong » trong cong, tong cong, thong thong
hanh tang » anh tang, hanh mang, hanh tung
theo chu » theo chieu, cho chu, chao chu
chu xanh » chu manh, chieu xanh, chua xang
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: theo chu xanh - ((hanh tang) or (hanh trang)) va ((nhung cong) OR (thong cong)) tac tren tau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu xanh - ((hanh tang) OR (hanh trang)) va ((nhung cong) OR (thong cong)) tac tren tau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chu xanh - ((hanh tang) or (hanh trang)) va ((nhung cong) OR (thong cong)) tac tren tau".
• Adding a wildcard symbol may retrieve word variants: theo chu xanh - ((hanh tang) or (hanh trang)) va ((nhung cong) OR (thong cong)) tac tren tau*.