Perhaps you should try some spelling variations:
truong long » trong long, trung long, truong cong
cua truong » cua trung, xuan truong, cac truong
tranh cua » doanh cua, manh cua
hieu luc » hieu luat
long van » luong van, song van, lang van
van han » van hanh, van phan, van nhan
han tap » han tai, toan tap, nhan tai

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 luc) or (hieu qua)) - canh tranh cua truong long van han tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu luc) OR (hieu qua)) - canh tranh cua truong long van han tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu luc) or (hieu qua)) - canh tranh cua truong long van han tap*.