Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cam thuc » am thuc, nam thuc, cam thu
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
thuc va » thuc vat, thuc dan, thuc day
va lanh » va lang, va danh, va hanh
dao cua » dai cua, day cua, dan cua
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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 sach ky nang o hai. ((hieu va) OR (lieu va)) cam thuc va lanh dao cua triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hai. ((hieu va) or (lieu va)) cam thuc va lanh dao cua triet*.