Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh de » hanh de, thanh ve, thanh do
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
cao hoi » co hoi, cao hoc, tao hoi
ve pham » vi pham, ve phan, ve phat
cua tre » cua te, cuu tre, cua triet
v pham » vi pham, d pham
de cua » le cua, te cua, dieu cua

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 ly nang ((cao hoi) or (cau hoi)). hieu ((ve pham) OR (v pham)) duc va thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang ((cao hoi) OR (cau hoi)). hieu ((ve pham) OR (v pham)) duc va thanh de cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang ((cao hoi) or (cau hoi)). hieu ((ve pham) OR (v pham)) duc va thanh de cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang ((cao hoi) or (cau hoi)). hieu ((ve pham) OR (v pham)) duc va thanh de cua tre*.