Perhaps you should try some spelling variations:
vay doanh » van doanh, ly doanh, voi doanh
cua triet » cua viet, su triet, va triet
cham duc » pham duc, cham soc, pham duy
va dinh » van dinh, va kinh, va tinh
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo

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 duc ((vay doanh) or (va dinh)) tai ((cua triet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu vu cham duc ((vay doanh) OR (va dinh)) tai ((cua triet) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu vu cham duc ((vay doanh) or (va dinh)) tai ((cua triet) or (cuu tre))*.