Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam thuc » nam thuoc, am thuc, nam thu
nang ma » tang ma, sang ma, mang may
qua nam » quan nam, cua nam, quang nam
thuc va » thuc vat, thuc dan, thuc day
tinh da » tinh gia, tinh lao, tinh nam
tinh va » tich va, trinh van, trinh vat
su sach » so sach, vu sach

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

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