Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
cau luc » cau truc, cau phuc
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
su sach » so sach, vu sach
ma hoi » ma hoa, me hoi, va hoi
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((((ma hoi) OR (xa hoi))) or (mai hoi)). hieu van cau luc va hang di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((((ma hoi) OR (xa hoi))) OR (mai hoi)). hieu van cau luc va hang di cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((((ma hoi) OR (xa hoi))) or (mai hoi)). hieu van cau luc va hang di cua viet*".