Perhaps you should try some spelling variations:
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
hanh tinh » hanh trinh, thanh tinh, canh tinh
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
nang ho » nang hoc, tang ho, nang cao
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 ho) or (nang co)) hoi. hieu ve cham duc va ((hanh tinh) OR (nhanh tinh)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang ho) OR (nang co)) hoi. hieu ve cham duc va ((hanh tinh) OR (nhanh tinh)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang ho) or (nang co)) hoi. hieu ve cham duc va ((hanh tinh) OR (nhanh tinh)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang ho) or (nang co)) hoi. hieu ve cham duc va ((hanh tinh) OR (nhanh tinh)) cua tre*.