Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
cuc ban » cua ban, cac ban, cuu ban
cam cuc » cam xuc, cham cuu, pham cuc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
van cam » van nam, van lam, van cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ky lang xa hoi. hieu van cam cuc ban hanh vi ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky lang xa hoi. hieu van cam cuc ban hanh vi ((cua tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky lang xa hoi. hieu van cam cuc ban hanh vi ((cua tre) or (va triet))*.