Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, dua tren
hanh di » hanh vi, hanh de, hang di
cuc ban » cua ban, cac ban, cuu ban
te sach » toc sach
cam cuc » cam xuc, cham cuu, pham cuc
van cam » van nam, van lam, van cau
ma hoi » mai hoi, ma hoa, me hoi

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 tru nang ((ma hoi) or (xa hoi)). hieu van cam cuc ban hanh di ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tru nang ((ma hoi) OR (xa hoi)). hieu van cam cuc ban hanh di ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tru nang ((ma hoi) or (xa hoi)). hieu van cam cuc ban hanh di ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach tru nang ((ma hoi) or (xa hoi)). hieu van cam cuc ban hanh di ((cua tre) OR (cua triet))*.