Perhaps you should try some spelling variations:
truong dao » truong dai, truong cao, truong bo
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
truong va » truong dai, truong cao, luong va
hoc hieu » hoc thieu, hoc hien, doc hieu
tan toan » tap toan, van toan, dan toan

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 va) or (truong dao)) nhung cong ((tan toan) or (tan tran)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh ((truong va) OR (truong dao)) nhung cong ((tan toan) OR (tan tran)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh ((truong va) or (truong dao)) nhung cong ((tan toan) or (tan tran)) ban*.