Perhaps you should try some spelling variations:
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
su sai » su tai, su hai, su dai
sai ky » sac ky
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

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 ((xa hoi) or (hoa hoi)). hieu va cam luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang ((xa hoi) OR (hoa hoi)). hieu va cam luc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sai ky nang ((xa hoi) or (hoa hoi)). hieu va cam luc va hanh vi cua tre*.