Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
te sach » toc sach
ty lang » tay lang, ty xang, tu lang
ty hang » ly hang, ty xang, thi hang
van lam » van nam
duoc va » nuoc va, duc va, duoc ma
va hang » van hang, va nang, va lang
va cua » va chua, via cua, ca cua

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 ((ty lang) or (ty hang)) xa hoi. hieu van lam duoc va hang va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty lang) OR (ty hang)) xa hoi. hieu van lam duoc va hang va cua triet.
• Adding a wildcard symbol may retrieve word variants: te sach ((ty lang) or (ty hang)) xa hoi. hieu van lam duoc va hang va cua triet*.