Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
ty nang » ky nang, ty hang, ly nang
va cham » va chat, va tham
cham tu » pham tu, cam tu, chai tu
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
co hoi » co hoc, co loi
cua te » cua tu
o hoi » o hoc, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ty nang) or (ty xang)) ((o hoi) OR (co hoi)). lieu va cham tu va hanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nang) OR (ty xang)) ((o hoi) OR (co hoi)). lieu va cham tu va hanh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty nang) or (ty xang)) ((o hoi) OR (co hoi)). lieu va cham tu va hanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty nang) or (ty xang)) ((o hoi) OR (co hoi)). lieu va cham tu va hanh lai cua te*.