Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
trinh vi » trinh va, trinh ve, trinh viet
trong xa » trong xay, trong ca, trong xu
vu sach » vu bach, su sach, vu khach
tinh vi » tinh voi, tinh va, dinh vi
cua tre » cua te, cuu tre, cua triet
coc tuc » coc luc, hoc thuc, doc thuc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
va coc » va cuoc, va cac, va hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach thu ((lang xa) or (trong xa)) hoi. hieu va coc tuc xa ((tinh vi) or (trinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu ((lang xa) OR (trong xa)) hoi. hieu va coc tuc xa ((tinh vi) OR (trinh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach thu ((lang xa) or (trong xa)) hoi. hieu va coc tuc xa ((tinh vi) or (trinh vi)) cua tre*.