Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
van hanh » van thanh, ban hanh, van ban
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam vuc » cam xuc
van anh » van thanh, tuan anh, van minh
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
cua tu » cua tuc, cua su, cua te
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: doc sach y nang xa hoi. hieu va cam vuc ((van hanh) or (van anh)) vi ((cua tu) or (cua cu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y nang xa hoi. hieu va cam vuc ((van hanh) OR (van anh)) vi ((cua tu) OR (cua cu)).
• Adding a wildcard symbol may retrieve word variants: doc sach y nang xa hoi. hieu va cam vuc ((van hanh) or (van anh)) vi ((cua tu) or (cua cu))*.