Perhaps you should try some spelling variations:
hanh doi » thanh doi, hanh noi, hang doi
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van dau » phan dau
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua
co hoi » co loi
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ((co hoi) OR (co hoc)). hieu ((van dau) or (van dao)) xuc va hanh doi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((co hoi) OR (co hoc)). hieu ((van dau) OR (van dao)) xuc va hanh doi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((co hoi) OR (co hoc)). hieu ((van dau) or (van dao)) xuc va hanh doi cua vat".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((co hoi) OR (co hoc)). hieu ((van dau) or (van dao)) xuc va hanh doi cua vat*.