Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu luat » hieu qua
lanh manh » lanh tranh, lan anh, van manh
cua nhung » va nhung
cong tinh » cong trinh, cong vinh, long tinh
hieu luc » hieu qua
manh cua » doanh cua, ban cua
toan cao » toan tap
toan ban » van ban

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 luat) or (hieu luc)) - lanh manh cua nhung cong tinh ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu luat) OR (hieu luc)) - lanh manh cua nhung cong tinh ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu luat) or (hieu luc)) - lanh manh cua nhung cong tinh ((toan cao) or (toan ban))*.