Perhaps you should try some spelling variations:
trinh vi » trinh va, trinh ve, trinh viet
trong xa » trong xay, trong ca, trong xu
hieu van » hieu va, thien van, lieu va
bach ty » sach ty, xach tay, bach thu
dinh vi » dinh ve, dinh viet, dinh tri
van coc » van hoc, van loc, van co
tang xa » trang xa, tang ma, lang xa
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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

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