Perhaps you should try some spelling variations:
hanh truong » hanh trong, anh truong, manh truong
hieu lang » chieu sang, hieu quang, nhieu tang
cong tinh » cong trinh, cong vinh, long tinh
hoc hieu » hoc thieu, hoc hien, doc hieu
dan dung » van dung, tin dung, ap dung
mai hung » manh hung, van hung
toan cau » toan cao, toan ban, toan tap

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 - hanh truong ((dan dung) or (mai hung)) cong tinh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh truong ((dan dung) OR (mai hung)) cong tinh toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh truong ((dan dung) or (mai hung)) cong tinh toan cau*.