Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
can thuc » dan thuc, van thuc, cay thuc
cam thuc » am thuc, cam thu, cay thuc
sach vu » sach va, sach tu, sach uu
nang ma » tang ma, sang ma, nang cao
vu nang » vuc nang, va nang, vu dang
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
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: su sach vu nang ma hoi. hieu van ((((cam thuc) OR (can thuc))) or (nam thuc)) va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach vu nang ma hoi. hieu van ((((cam thuc) OR (can thuc))) OR (nam thuc)) va hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach vu nang ma hoi. hieu van ((((cam thuc) OR (can thuc))) or (nam thuc)) va hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach vu nang ma hoi. hieu van ((((cam thuc) OR (can thuc))) or (nam thuc)) va hanh vi cua triet*.