Perhaps you should try some spelling variations:
can thiet » dan thiet, cac thiet, cad thiet
cham xuc » cam xuc, chat xuc, cham soc
van hanh » van thanh, ban hanh, van anh
duy sang » duy van, duy can, duy anh
va thanh » gia thanh, ban thanh, va tinh
voi can » voi cac, voi cong, voi hang
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ty sang » ty xang, ty hang, thu sang
ve cham » va cham, ve chat, vu cham

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty sang) OR (duy sang)) ma hoa. hieu ve cham xuc ((va thanh) or (van hanh)) voi can thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty sang) OR (duy sang)) ma hoa. hieu ve cham xuc ((va thanh) OR (van hanh)) voi can thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty sang) OR (duy sang)) ma hoa. hieu ve cham xuc ((va thanh) or (van hanh)) voi can thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty sang) OR (duy sang)) ma hoa. hieu ve cham xuc ((va thanh) or (van hanh)) voi can thiet*.