Perhaps you should try some spelling variations:
sach cao » sach dao, sach cap, mach cao
cao cong » cac cong, cao dang, cua cong
van chat » cao chat
nang tai » hang tai, tang tai, sang tai
tu sach » thu sach, su sach, te sach
van hoc » van hoa
cac luc » cau luc, coc luc, cac nuoc
va nang » van nang, da nang, cam nang
luc va » duc va, tuc va, loc va
cuc » cuoc, chuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach cao cong ((van hoc) or (van chat)). lieu va cac luc va nang tai cuc (thue* or thuc*)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach cao cong ((van hoc) OR (van chat)). lieu va cac luc va nang tai cuc (thue* OR thuc*).
• Adding a wildcard symbol may retrieve word variants: tu sach cao cong ((van hoc) or (van chat)). lieu va cac luc va nang tai cuc (thue* or thuc*)*.