Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tham thuc » nham thuc, pham thuc, thai thuc
van hanh » van thanh, ban hanh, van anh
tam thuc » am thuc, nam thuc, dam thuc
sach ky » sac ky, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
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 y)) nang ma hoi. hieu va ((tham thuc) OR (tam thuc)) van 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 va ((tham thuc) OR (tam thuc)) van 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 va ((tham thuc) OR (tam thuc)) van hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach y)) nang ma hoi. hieu va ((tham thuc) OR (tam thuc)) van hanh vi cua triet*.