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

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. lieu va ((cham tu) OR (cam 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. lieu va ((cham tu) OR (cam 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. lieu va ((cham tu) OR (cam tu)) va hanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty nang) or (ty xang)) o hoi. lieu va ((cham tu) OR (cam tu)) va hanh lai cua te*.