Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dieu can » dieu hanh, tiep can, dieu cua
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
va tam » van tam, va tham, va tac
tam tu » nam tu, cam tu, dam tu
di cau » da cau, diem cau

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 xa hoi. hieu va tam tu va hanh ((di cau) or (dieu can)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. hieu va tam tu va hanh ((di cau) OR (dieu can)) tren.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. hieu va tam tu va hanh ((di cau) or (dieu can)) tren*.