Perhaps you should try some spelling variations:
hiem ngan » kim ngan, viem gan
hanh tran » hanh trang, thanh tran, hanh tram
van nhung » van nhuong, va nhung, van hung
cong vang » cong lang, cong quang, cong ngang
hoc hiem » hoc hien, hoc thieu, hoc thiet
tran van » luan van
cong van » cong san, song van, cong tan
ban cao » bao cao, ban can, ban co

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hiem ngan - hanh tran van nhung ((cong van) OR (cong vang)) ban cao~".
• Adding a wildcard symbol may retrieve word variants: hoc hiem ngan - hanh tran van nhung ((cong van) OR (cong vang)) ban cao*.