Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
thuc van » thuc vat, thuc dan, thuc va
cam thuc » am thuc, nam thuc, cam thu
minh te » minh ve, minh de, minh tu
hieu va » lieu va, hieu qua
hoi hoi » hoi hoc, hoc hoi, hoi doi
xac ky » cac ky, sac ky, bac ky
va cam » va cham, va cac, va cao
ho hoi » hoc hoi, hoa hoi, co hoi
su xac » pu xac, su cac

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: su xac ky nang ((ho hoi) OR (hoi hoi)). hieu va cam thuc van ((minh te) OR (kinh te)) va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky nang ((ho hoi) or (hoi hoi)). hieu va cam thuc van ((minh te) OR (kinh te)) va triet~".
• Adding a wildcard symbol may retrieve word variants: su xac ky nang ((ho hoi) or (hoi hoi)). hieu va cam thuc van ((minh te) OR (kinh te)) va triet*.