Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc va » thuc vat, thuc dan, thuc day
nang co » nang cao, nang doc, nang noi
hieu va » lieu va
dan tai » van tai, dan thi, han tai
dan vai » dan va, dan vat, den vai
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
co hoi » co hoc, co loi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang co hoi. ((hieu va) OR (hieu qua)) am thuc va ((dan vai) OR (dan tai)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang co hoi. ((hieu va) or (hieu qua)) am thuc va ((dan vai) OR (dan tai)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang co hoi. ((hieu va) or (hieu qua)) am thuc va ((dan vai) OR (dan tai)) cua triet*.