Perhaps you should try some spelling variations:
nhung long » nhung cong, nhung lang, hung long
lanh manh » lanh tranh, lan anh, van manh
hieu cach » hieu cac, chieu sach, hieu ca
cua nhung » va nhung
long tinh » cong tinh, trong tinh, luong tin
hieu luc » hieu luat, 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 cach) or (hieu luc)) - lanh manh cua nhung long tinh ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cach) OR (hieu luc)) - lanh manh cua nhung long tinh ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu cach) or (hieu luc)) - lanh manh cua nhung long tinh ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) or (hieu luc)) - lanh manh cua nhung long tinh ((toan cao) OR (toan ban))*.