Perhaps you should try some spelling variations:
trinh cong » trinh dung
hanh tang » hanh trang, anh tang, hanh tung
hanh mang » nhanh mang, hanh trang, nhanh lang
qua trinh » qua kinh
cong tan » cong tac, cong san, cong thanh
cua chu » sua chua
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: (((chao or cao) xu) or (cua chu)) xanh - ((hanh tang) OR (hanh mang)) qua trinh cong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((chao OR cao) xu) OR (cua chu)) xanh - ((hanh tang) OR (hanh mang)) qua trinh cong tan van ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((chao or cao) xu) or (cua chu)) xanh - ((hanh tang) OR (hanh mang)) qua trinh cong tan van ban*".