Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, dua tren
te sach » toc sach
nam cuc » nam cac, nam cua, nam thuc
lang ha » long ha
cuc ban » cua ban, cac ban, cuu ban
sach o » sach lo, sac o, sach y
ha hoi » hoa hoi, ha noi, xa hoi
o lang » hoa lang, hoi lang

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) OR (va 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) OR (va triet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach o lang ha hoi. hieu van nam cuc ban hanh vi ((cua tre) or (((cua triet) OR (va 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) OR (va triet))))*.