Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc day » thuc dan, thuc vat
qua tham » qua cham, qua than, qua thanh
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach ty, sach kem
thuc va » thuc vat, thuc dan
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sach y)) nang ma hoi. hieu qua tham ((thuc va) OR (thuc day)) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) nang ma hoi. hieu qua tham ((thuc va) OR (thuc day)) hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach y)) nang ma hoi. hieu qua tham ((thuc va) OR (thuc day)) hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach y)) nang ma hoi. hieu qua tham ((thuc va) OR (thuc day)) hanh vi cua triet*.