Perhaps you should try some spelling variations:
tranh trong » tran trong, trinh trong, anh trong
nhieu tang » chieu sang, nhiet nang
hanh trong » hanh trang, anh trong, hinh trong
hieu lang » chieu sang, hieu quang, hieu van
trong tan » trong quan, trong cac, trong ca
qua dung » quang dung, su dung, qua song
tran cau » tran chau, toan cau, ran cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) OR (nhieu tang)) - ((tranh trong) or (hanh trong)) qua dung trong tan tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (nhieu tang)) - ((tranh trong) OR (hanh trong)) qua dung trong tan tran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((hieu lang) OR (nhieu tang)) - ((tranh trong) or (hanh trong)) qua dung trong tan tran cau".
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) OR (nhieu tang)) - ((tranh trong) or (hanh trong)) qua dung trong tan tran cau*.