Perhaps you should try some spelling variations:
ky tang » ky nang, ky dang, kho tang
tang ha » lang ha, tang ma, trung ha
hieu va » lieu va
te cac » tu cac, ve cac, te cao
ha hoi » hoa hoi, ha noi, xa hoi
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc va
vi cua » vai cua, di cua
cua te » cua tu

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