Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
hang di » hang doi, hang vi, hang dien
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
va nham » va cham, va tham, va nha
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va hang » van hang, va nang, va lang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang xa hoi. hieu va nham thuc va hang di ((((cua triet) or (cua te))) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu va nham thuc va hang di ((((cua triet) OR (cua te))) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu va nham thuc va hang di ((((cua triet) or (cua te))) or (va triet))*.