Perhaps you should try some spelling variations:
phuong van » phung van, phong van, phuong va
phuong lan » phuong la, thuong lan, phuong linh
hieu lang » chieu sang, hieu quang, nhieu tang
trung ha » trung hoc, trung tam, trung cap
tran van » luan van
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh ((trung ha) or (tran van)) nhung ((phuong van) OR (phuong lan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh ((trung ha) OR (tran van)) nhung ((phuong van) OR (phuong lan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - thanh ((trung ha) or (tran van)) nhung ((phuong van) OR (phuong lan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - thanh ((trung ha) or (tran van)) nhung ((phuong van) OR (phuong lan)) toan cao*.