Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang di » nang du, hang di, nang ji
va nang » van nang, da nang, cam nang
cau loc » hau loc, cau hoc, cau luc
thi van » thi lan, thi hanh, thi nang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
loc va » hoc va, luc va
ma hoi » xa hoi, ma hoa, me hoi
di cua » dai cua, doi cua, de cua

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 ky nang ((ma hoi) OR (mai hoi)). ((thien van) OR (thi van)) cau loc va nang di cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((ma hoi) or (mai hoi)). ((thien van) OR (thi van)) cau loc va nang di cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((ma hoi) or (mai hoi)). ((thien van) OR (thi van)) cau loc va nang di cua triet*.