Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cua viet » ca viet, hoa viet, cua vat
thuc day » thuc dan
sach vu » sach va, sach tu, sach uu
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
vu nang » vuc nang, va nang, vu dang
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach vu nang xa hoi. hieu ve cam ((thuc vat) or (thuc day)) hanh vi ((cua viet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach vu nang xa hoi. hieu ve cam ((thuc vat) OR (thuc day)) hanh vi ((cua viet) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: su sach vu nang xa hoi. hieu ve cam ((thuc vat) or (thuc day)) hanh vi ((cua viet) or (va triet))*.