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