Perhaps you should try some spelling variations:
thien van » thi van
thanh van » thanh san, thanh toan, thanh phan
hieu van » hieu va, lieu va, hieu ve
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
dua ban » dia ban, qua ban, mua ban
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet

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 ky nang ma hoa. ((hieu van) OR (thien van)) lam ((dua ban) or (cua ban)) thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoa. ((hieu van) OR (thien van)) lam ((dua ban) OR (cua ban)) thanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoa. ((hieu van) OR (thien van)) lam ((dua ban) or (cua ban)) thanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoa. ((hieu van) OR (thien van)) lam ((dua ban) or (cua ban)) thanh van cua tre*.