Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
nhieu tang » chieu sang, nhiet nang
thong cong » trong cong, tong cong, thong thong
chuan chau » chuan chat, chuan ha, chua chay
thanh chau » thanh cha, thanh cham, thanh chu
hieu lang » chieu sang, hieu quang, hieu van
trang va » tran van, hang va
va thong » va thuong, va phuong, he thong
cong van » cong vang, cong san, song van

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 lang) OR (nhieu tang)) - hanh trang va thong cong van ((chuan chau) or (thanh chau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu lang) OR (nhieu tang)) - hanh trang va thong cong van ((chuan chau) OR (thanh chau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu lang) OR (nhieu tang)) - hanh trang va thong cong van ((chuan chau) or (thanh chau))".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu lang) OR (nhieu tang)) - hanh trang va thong cong van ((chuan chau) or (thanh chau))*.