Perhaps you should try some spelling variations:
nhanh soc » nganh soc, nhanh doc, nhanh song
thanh soc » thanh son, thanh hoc, thanh ngoc
ban hang » ngan hang
trung ha » trung hoc, trung tam, trung cap
hang vi » hang va, hanh vi, hang di
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky ((lang ha) OR (trung ha)) hoi. hieu qua ((thanh soc) OR (nhanh soc)) ban hang vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky ((lang ha) or (trung ha)) hoi. hieu qua ((thanh soc) OR (nhanh soc)) ban hang vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: te cac ky ((lang ha) or (trung ha)) hoi. hieu qua ((thanh soc) OR (nhanh soc)) ban hang vi cua tre*.