Perhaps you should try some spelling variations:
trinh va » trinh van, trinh vat, trinh ve
trinh vi » trinh ve, trinh viet, trinh van
su sach » so sach, vu sach
luc may » truc may, phuc may
cam luc » cam xuc, cau luc
ty hang » ly hang, ty xang, thi hang
ty dang » ty xang, ky dang, ty dong
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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 may ((trinh vi) OR (trinh va)) cua 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 may ((trinh vi) OR (trinh va)) cua 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 may ((trinh vi) OR (trinh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty dang) or (ty hang)) xa hoi. lieu va cam luc may ((trinh vi) OR (trinh va)) cua tre*.