Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tham soc » tham nuoc, thai son, ham so
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
hoa hoi » khoa hoi, hoa hoc, hoa doi
sy long » sy luong, quy long
cac sy » cac ky, bac sy
ha hoi » ha noi, xa hoi, va hoi
vi cua » vai cua, di cua
te cac » tu cac, ve cac, te cao

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 sy long ((ha hoi) or (hoa hoi)). hieu va ((tham soc) or (cham soc)) van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac sy long ((ha hoi) OR (hoa hoi)). hieu va ((tham soc) OR (cham soc)) van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te cac sy long ((ha hoi) or (hoa hoi)). hieu va ((tham soc) or (cham soc)) van hanh vi cua tre*.