Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc van » thuc vat, thuc dan, thuc va
hang dai » hoang dai, hang tai, hang dau
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
tuc van » truc van, tuc va, duc van
ve cam » ve cham, ve cac, va cam

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty xang) OR (ky nang)) xa hoi. hieu ve cam ((tuc van) OR (thuc van)) hang dai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty xang) or (ky nang)) xa hoi. hieu ve cam ((tuc van) OR (thuc van)) hang dai cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty xang) or (ky nang)) xa hoi. hieu ve cam ((tuc van) OR (thuc van)) hang dai cua triet*.