Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh hai, thanh lap
hieu van » hieu va, thien van, lieu va
hanh lam » thanh lap, hanh kem, hanh va
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
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 ty nang ma hoi. ((hieu ve) OR (hieu van)) cac xuc va ((thanh loi) or (hanh lam)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. ((hieu ve) OR (hieu van)) cac xuc va ((thanh loi) OR (hanh lam)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ma hoi. ((hieu ve) OR (hieu van)) cac xuc va ((thanh loi) or (hanh lam)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. ((hieu ve) OR (hieu van)) cac xuc va ((thanh loi) or (hanh lam)) cua tre*.