Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
luoc can » luc canh, hoc can, luoc dai
luoc van » luoc va, luc van, luot van
luan va » luan van, luat va
te sach » toc sach
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
van dai » vanh dai, van dao, van hai
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 nang) OR (ty hang)) xa hoi. hieu van dai ((luoc van) or (luoc can)) luan va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ty hang)) xa hoi. hieu van dai ((luoc van) OR (luoc can)) luan va cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) OR (ty hang)) xa hoi. hieu van dai ((luoc van) or (luoc can)) luan va cua triet*".