Perhaps you should try some spelling variations:
nhung huong » nhung phuong, nhung tuong, nhung cong
hieu lang » chieu sang, hieu quang, nhieu tang
huong ban » huong dan, huong ben, huong lan
hoc hieu » hoc thieu, hoc hien, doc hieu
trang va » hang va
tran van » luan van
ban khan » ban than, ban nhan, ban chan
khan cap » khan ap, than cap, khoan cam

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 - thanh ((trang va) or (tran van)) nhung huong ban khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - thanh ((trang va) OR (tran van)) nhung huong ban khan cap.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - thanh ((trang va) or (tran van)) nhung huong ban khan cap*.