Perhaps you should try some spelling variations:
canh trang » canh tranh, hanh trang, banh trang
nhieu tang » chieu sang, nhiet nang
nhung cong » thong cong, hang cong, nhung don
hieu lang » chieu sang, hieu quang, hieu van
dung cong » dung trong
trang va » tran van, hang va
van tan » van tuan, van ban, van tai
tan ban » toan ban, tang ban, van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) or (nhieu tang)) - canh trang va ((nhung cong) OR (dung cong)) van tan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (nhieu tang)) - canh trang va ((nhung cong) OR (dung cong)) van tan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) or (nhieu tang)) - canh trang va ((nhung cong) OR (dung cong)) van tan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (nhieu tang)) - canh trang va ((nhung cong) OR (dung cong)) van tan ban*.