Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
cua triet » cua viet, su triet, va triet
cua tre » cua te, cuu tre, dua tren
doan vi » doan va, don vi, doan thi
va doan » va doanh, van doan, va dan
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
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 sang ((ma hoi) or (xa hoi)). hieu ve cham thuc va doan vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ((ma hoi) OR (xa hoi)). hieu ve cham thuc va doan vi ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ((ma hoi) or (xa hoi)). hieu ve cham thuc va doan vi ((cua tre) or (cua triet))*.