Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
luat duoc » luat tuc
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, lam thuoc, tao duoc
va hang » van hang, va nang, va lang
te sach » toc sach
ty hang » ly hang, ty xang, thi hang
ty lang » tay lang, ty xang, tu 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) or (luat 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) OR (luat 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) or (luat duoc)) va hang va cua triet*.