Perhaps you should try some spelling variations:
hanh doi » thanh doi, hanh noi, hang doi
tu sach » thu sach, su sach, te sach
van cam » van lam, van cau, van dam
va hanh » van hanh, va thanh, va danh
doi cua » dai cua, hoi cua
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
x hoi » o hoi, x ho, 5 hoi

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 y nang ((x hoi) OR (xa hoi)). hieu ((van cam) or (van nam)) xuc va hanh doi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (xa hoi)). hieu ((van cam) OR (van nam)) xuc va hanh doi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) OR (xa hoi)). hieu ((van cam) or (van nam)) xuc va hanh doi cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) OR (xa hoi)). hieu ((van cam) or (van nam)) xuc va hanh doi cua vat*.