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
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
va danh » va dinh, dia danh, va thanh
va hanh » van hanh, va thanh, ban hanh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang ma hoi. hieu van nam thuc ((((va danh) OR (va dan))) or (va hanh)) dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ma hoi. hieu van nam thuc ((((va danh) OR (va dan))) OR (va hanh)) dai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ma hoi. hieu van nam thuc ((((va danh) OR (va dan))) or (va hanh)) dai cua triet*".