Perhaps you should try some spelling variations:
trinh vi » trinh va, trinh ve, trinh viet
va trinh » van trinh, va tinh, lap trinh
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
cam luc » cam xuc, cau luc
ty hang » ly hang, ty xang, thi hang
ty dang » ty xang, ky dang, ty dong
cuu tre » cau tren, cau treo
va cam » va cham, va cac, va cao
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: su sach ((ty dang) or (ty hang)) xa hoi. lieu va cam luc va trinh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty dang) OR (ty hang)) xa hoi. lieu va cam luc va trinh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty dang) or (ty hang)) xa hoi. lieu va cam luc va trinh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty dang) or (ty hang)) xa hoi. lieu va cam luc va trinh vi ((cua tre) OR (cuu tre))*.