Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
te sach » toc sach
lang ha » long ha
nam cuc » nam cac, nam cua, nam thuc
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, dua tren
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
ha hoi » hoa hoi, ha noi, xa 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 o lang ha hoi. hieu van nam cuc ban hanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach o lang ha hoi. hieu van nam cuc ban hanh vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: te sach o lang ha hoi. hieu van nam cuc ban hanh vi ((cua tre) or (cua triet))*.