Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cua viet » ca viet, hoa viet, cua vat
va triet » va thiet, va trien, ve triet
thuc van » thuc vat, thuc dan, thuc va
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
anh vi » hanh vi, anh va, anh vu
anh ve » hanh ve, anh va, anh viet
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky lang xa hoi. hieu va tham thuc van ((anh vi) or (anh ve)) ((va triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky lang xa hoi. hieu va tham thuc van ((anh vi) OR (anh ve)) ((va triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky lang xa hoi. hieu va tham thuc van ((anh vi) or (anh ve)) ((va triet) or (cua viet))*.