Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dinh van » sinh vat
chat xuc » chat huu, cam xuc, chao xu
dinh va » dinh ve, tinh va, sinh va
tu sach » thu sach, su sach, te sach
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
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: tu sach y nang ma hoi. ((hieu ve) OR (hieu van)) chat xuc va ((dinh va) or (dinh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. ((hieu ve) OR (hieu van)) chat xuc va ((dinh va) OR (dinh van)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. ((hieu ve) OR (hieu van)) chat xuc va ((dinh va) or (dinh van)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. ((hieu ve) OR (hieu van)) chat xuc va ((dinh va) or (dinh van)) cua tre*.