Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va tuyen » va truyen, tac tuyen, ke tuyen
lam thuc » lam thuoc, am thuc, nam thuc
tinh vai » tinh va, tinh hai, tinh bai
hieu van » hieu va, thien van, lieu va
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
van lam » van nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((nang ma) or (tang ma)) hoi. hieu van lam thuc va tinh vai ((cua triet) or (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang ma) OR (tang ma)) hoi. hieu van lam thuc va tinh vai ((cua triet) OR (va tuyen)).
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang ma) or (tang ma)) hoi. hieu van lam thuc va tinh vai ((cua triet) or (va tuyen))*.