Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vanh dai » van dai, vanh tai, lanh dao
cau thuc » cau truc, cuu thuc, can thuc
va vanh » va van, va danh, va hanh
thuc va » thuc vat, thuc dan, thuc day
hieu va » hieu qua
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
sang ma » tang ma, nang ma, sang tao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang cao) or (sang ma)) hoi. ((lieu va) or (hieu va)) cau thuc va vanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang cao) OR (sang ma)) hoi. ((lieu va) OR (hieu va)) cau thuc va vanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang cao) or (sang ma)) hoi. ((lieu va) or (hieu va)) cau thuc va vanh dai cua triet*.