Perhaps you should try some spelling variations:
dua tren » dung tren
hanh vai » hanh vi, hanh tai, hanh van
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
hanh va » hang va, hanh vi
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
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: te sac ky nang o hoi. hieu ve cac duc va ((hanh vai) or (hanh va)) ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang o hoi. hieu ve cac duc va ((hanh vai) OR (hanh va)) ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: te sac ky nang o hoi. hieu ve cac duc va ((hanh vai) or (hanh va)) ((dua tren) or (cua te))*.