Perhaps you should try some spelling variations:
hanh tran » hanh trang, thanh tran, hanh tram
van nhung » van nhuong, va nhung, van hung
thanh cao » thanh ca, thanh cac, thanh thao
hoc hiem » hoc thieu, hoc thiet, hoc nhiet
tran van » luan van
cong van » cong vang, cong san, cong tan
song van » hoang van, trong van, duong van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hiem) OR (hoc hien)) ngan - hanh tran van nhung ((cong van) OR (song van)) thanh cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc hiem) or (hoc hien)) ngan - hanh tran van nhung ((cong van) OR (song van)) thanh cao~".
• Adding a wildcard symbol may retrieve word variants: ((hoc hiem) or (hoc hien)) ngan - hanh tran van nhung ((cong van) OR (song van)) thanh cao*.