Perhaps you should try some spelling variations:
duoc cach » cuoc cach, duoc cac, truoc cach
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cach ky » cac ky
cu tren » tu tren, dua tren
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: duoc cach ky nang o hoi. hieu ve pham duc ((va hanh) OR (va danh)) vi ((cua te) OR (cu tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "duoc cach ky nang o hoi. hieu ve pham duc ((va hanh) OR (va danh)) vi ((cua te) or (cu tren))~".
• Adding a wildcard symbol may retrieve word variants: duoc cach ky nang o hoi. hieu ve pham duc ((va hanh) OR (va danh)) vi ((cua te) or (cu tren))*.