Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
nang xa » nang x, lang xa, nang ma
nam tuc » nam thuc, nam truc, nam tu
va hanh » van hanh, va thanh, va danh
va nam » van nam, ha nam, va nay
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
cua cu » cua chu, cua cau, cua su

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) or (dac sac)) ky nang xa hoi. lieu va nam tuc va hanh tai ((cua te) or (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (dac sac)) ky nang xa hoi. lieu va nam tuc va hanh tai ((cua te) OR (cua cu)).
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (dac sac)) ky nang xa hoi. lieu va nam tuc va hanh tai ((cua te) or (cua cu))*.