Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, dua tren
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa

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 ma hoi. hieu van ((cam xuc) or (cao duc)) ban thanh pho ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. hieu van ((cam xuc) OR (cao duc)) ban thanh pho ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. hieu van ((cam xuc) or (cao duc)) ban thanh pho ((cua tre) or (cua triet))*.