Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, co sach
hoi cua » hoi chuc
doi cua » dai cua
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
tuc va » thuc va, truc va, tuc xa
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang ma hoi. ((hieu ve) OR (hieu van)) cam tuc va thanh ((doi cua) or (hoi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ma hoi. ((hieu ve) OR (hieu van)) cam tuc va thanh ((doi cua) OR (hoi cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ma hoi. ((hieu ve) OR (hieu van)) cam tuc va thanh ((doi cua) or (hoi cua)) te".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ma hoi. ((hieu ve) OR (hieu van)) cam tuc va thanh ((doi cua) or (hoi cua)) te*.