Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
thuc dan » thuc hanh, hoc dan, thuc vat
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
su sai » su tai, su hai, su dai
luc va » duc va, tuc va, loc va
sai ky » sac ky
cua te » cua tu
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky nang ((x hoi) OR (o hoi)). hieu va cac ((luc va) or (thuc dan)) hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang ((x hoi) OR (o hoi)). hieu va cac ((luc va) OR (thuc dan)) hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky nang ((x hoi) OR (o hoi)). hieu va cac ((luc va) or (thuc dan)) hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: su sai ky nang ((x hoi) OR (o hoi)). hieu va cac ((luc va) or (thuc dan)) hanh vai cua te*.