Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
khach tu » khach deu, khanh thu, hanh tu
hanh lam » thanh lap, hanh kem, hanh va
hanh lai » hanh tai, thanh lap, thanh loi
cua tre » cuu tre, cua triet, dua tren
cac duc » cac du, cao duc, cac dac
qua cac » cua cac
tu nang » tru nang, tu nong, tu nano
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.

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach tu nang o hoi. hieu qua cac duc va ((hanh lai) or (hanh lam)) ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach tu nang o hoi. hieu qua cac duc va ((hanh lai) OR (hanh lam)) ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: vu khach tu nang o hoi. hieu qua cac duc va ((hanh lai) or (hanh lam)) ((cua tre) or (cua te))*.