Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nang doc » nang luc
doc hoi » duoc hoi, hoc hoi, doc hai
qua cac » cua cac
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu bach) or (vu khach)) ky nang doc hoi. hieu qua cac tu ((va hanh) OR (va danh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu bach) OR (vu khach)) ky nang doc hoi. hieu qua cac tu ((va hanh) OR (va danh)) vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu bach) or (vu khach)) ky nang doc hoi. hieu qua cac tu ((va hanh) OR (va danh)) vai cua tre*".