Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc dan » thuc hanh, hoc dan
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach kem
va tham » van tham, va cham, va thanh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
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 ty)) nang ma hoi. hieu va tham ((thuc dan) OR (thuc vat)) hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang ma hoi. hieu va tham ((thuc dan) OR (thuc vat)) hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach ty)) nang ma hoi. hieu va tham ((thuc dan) OR (thuc vat)) hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach ty)) nang ma hoi. hieu va tham ((thuc dan) OR (thuc vat)) hanh vi cua triet*.