Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
vu cham » va cham, vu kham, tu cham
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, v nang
vi cau » va cau, ve cau, di 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 y nang xa hoi. hieu ((va cam) or (vu cham)) loc ((van hanh) or (va danh)) vi cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu ((va cam) OR (vu cham)) loc ((van hanh) OR (va danh)) vi cau treo.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang xa hoi. hieu ((va cam) or (vu cham)) loc ((van hanh) or (va danh)) vi cau treo*.