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
dinh vai » dinh van, dinh vi, dinh va
van luat » dan luat, va luat, van xuat
toc sach » hoc sach, doc sach, thuoc sach
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
duoc va » nuoc va, duc va, duoc ma
va dinh » van dinh, va kinh, va tinh
vai cua » dai cua, hai cua, lai 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) or (toc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu van luat duoc va dinh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu van luat duoc va dinh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu van luat duoc va dinh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ((ky lang) OR (ky tang)) xa hoi. hieu van luat duoc va dinh vai cua triet*.