Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
van chat » cao chat
mai hoi » mai khoi, dai hoi, lai hoi
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
hang di » hang doi, hang vi, hang dien
su sach » so sach, vu sach
ma hoi » xa hoi, ma hoa, me hoi
tuc va » thuc va, tuc xa, duc 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 hoi) OR (mai hoi)). hieu van chat ((tuc va) OR (truc va)) hang di su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((ma hoi) or (mai hoi)). hieu van chat ((tuc va) OR (truc va)) hang di su triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((ma hoi) or (mai hoi)). hieu van chat ((tuc va) OR (truc va)) hang di su triet*.