Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh nam » hanh nam, thanh tam, thanh pham
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty hang, ly nang
so lai » so loai, so lam, so lao
o lai » o lao

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 ((ty nang) OR (ty xang)) ((o lai) or (so lai)). hieu van cau duc va thanh nam cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) ((o lai) OR (so lai)). hieu van cau duc va thanh nam cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty xang)) ((o lai) or (so lai)). hieu van cau duc va thanh nam cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty xang)) ((o lai) or (so lai)). hieu van cau duc va thanh nam cua triet*.