Perhaps you should try some spelling variations:
thanh ban » thanh san, thanh van, thanh bac
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ban cua » ban quan
hieu va » lieu va, hieu qua
nang co » nang cao, nang doc, nang noi
hieu ve » hieu van
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
co loi » co hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang co loi. ((hieu ve) OR (hieu va)) cam ((xuc va) or (tuc xa)) thanh ban cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang co loi. ((hieu ve) OR (hieu va)) cam ((xuc va) OR (tuc xa)) thanh ban cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang co loi. ((hieu ve) OR (hieu va)) cam ((xuc va) or (tuc xa)) thanh ban cua tre*".