Perhaps you should try some spelling variations:
danh nhan » doanh nhan, thanh nhan, benh nhan
van nhan » van phan, van thanh, van khanh
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
va cham » va chat, va tham
vu cham » vu kham, tu cham, qua cham
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
tai va » thai va, mai va, tri va
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang xa hoi. hieu ((vu cham) or (va cham)) xuc ((van nhan) OR (danh nhan)) tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu ((vu cham) OR (va cham)) xuc ((van nhan) OR (danh nhan)) tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang xa hoi. hieu ((vu cham) or (va cham)) xuc ((van nhan) OR (danh nhan)) tai va thiet".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu ((vu cham) or (va cham)) xuc ((van nhan) OR (danh nhan)) tai va thiet*.