Perhaps you should try some spelling variations:
truong cong » trong cong, truong dong, truong long
hanh trang » thanh trung, canh tranh, hanh trinh
cua truong » cua trung, xuan truong, cac truong
trang cua » tranh cua, tang cua, trung cua
hieu luc » hieu luat
cong san » cong tac
san tan » van tan, san van, san tay
tan tat » ban tat, toan tap, toan 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)) - hanh trang cua truong cong san tan tat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu luc) OR (hieu qua)) - hanh trang cua truong cong san tan tat.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu luc) or (hieu qua)) - hanh trang cua truong cong san tan tat*.