Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
sach tham » sach nha
trong xu » thong xu, trong su, trong thu
vu sach » vu bach, su sach, vu khach
tinh vi » trinh vi, tinh voi, tinh va
cua tre » cua te, cuu tre, cua triet
coc tuc » coc luc, hoc thuc, doc thuc
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
tuc va » thuc va, truc va, tuc xa
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 tham ((tang xa) or (trong xu)) hoi. hieu va coc tuc va ((tinh vi) or (trinh viet)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tham ((tang xa) OR (trong xu)) hoi. hieu va coc tuc va ((tinh vi) OR (trinh viet)) cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach tham ((tang xa) or (trong xu)) hoi. hieu va coc tuc va ((tinh vi) or (trinh viet)) cua tre*.