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