Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
xach tay » canh tay
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
xang va » hang va, bang va, dang va
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cuu tre, cua triet
va hoi » xa hoi, va hoc, va hoa
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
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: so ((xach tay) or (sach tu)) xang va hoi. hieu va chat ((xac va) or (tuc va)) thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((xach tay) OR (sach tu)) xang va hoi. hieu va chat ((xac va) OR (tuc va)) thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so ((xach tay) or (sach tu)) xang va hoi. hieu va chat ((xac va) or (tuc va)) thanh vi cua tre*.