Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hieu nganh » vien nganh, hieu manh, nghiep nganh
hiem ngan » kim ngan, viem gan
tuan chau » tran chau, chuan chau, thanh chau
va tuong » va thuong, va thong, xa truong
cong van » cong vang, cong san, song van
van tuan » van quan, van ban, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu nganh) OR (hiem ngan)) - hanh trang ((va tuong) or (he thong)) cong van tuan chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu nganh) OR (hiem ngan)) - hanh trang ((va tuong) OR (he thong)) cong van tuan chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu nganh) OR (hiem ngan)) - hanh trang ((va tuong) or (he thong)) cong van tuan chau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu nganh) OR (hiem ngan)) - hanh trang ((va tuong) or (he thong)) cong van tuan chau*.