Perhaps you should try some spelling variations:
tham sac » pham sach, cham soc, pham san
van hanh » van thanh, ban hanh, van anh
ky lang » ky nang, ky dang, ky tang
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
sac van » cac van, san van, sat van
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
ha hoi » ha noi, xa hoi, va hoi
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: te cac ky lang ((ha hoi) or (hoa hoi)). hieu va tham sac van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky lang ((ha hoi) OR (hoa hoi)). hieu va tham sac van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te cac ky lang ((ha hoi) or (hoa hoi)). hieu va tham sac van hanh vi cua tre*.