Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
thai cua » than cua, tai cuc, tri cua
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
duc van » duc va, duc tan, duc manh
xuc ban » duc ban, cuc ban, quoc ban
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
nang ho » nang hoc, nang co, tang ho
cua tre » cua te, cuu tre, cua triet
ho hai » hoc hai, pho hai, cho hai

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 ho hai. ((hieu ve) OR (hieu van)) cac ((xuc ban) or (duc van)) nhanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ho hai. ((hieu ve) OR (hieu van)) cac ((xuc ban) OR (duc van)) nhanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ho hai. ((hieu ve) OR (hieu van)) cac ((xuc ban) or (duc van)) nhanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ho hai. ((hieu ve) OR (hieu van)) cac ((xuc ban) or (duc van)) nhanh thai cua tre*.