Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van chat » cao chat
hang di » hang doi, hang vi, hang dien
va hang » van hang, va nang, va lang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
van cau » van dau, van hau, toan cau
luc va » duc va, tuc va, loc va
di su » doi su, ki su, da su

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