Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
nang doc » nang luc
hanh dai » hanh tai, hanh dao, vanh dai
doc hoi » duoc hoi, hoc hoi, doc hai
qua cac » cua cac
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
cac tu » cac thu, cach tu, cac du
cua te » cua tu

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 dai ((cua tre) OR (cua te))~.
• 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 dai ((cua tre) OR (cua te))*.
• 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 dai ((cua tre) OR (cua te))*".