Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
su sach » vu sach
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
nang ma » tang ma, sang ma, nang cao
van cac » van hac, van cau, van bac
cac dac » cac dan, cac dai, cac bac
dac van » cac van, dao van, dam van
y nang » ky nang, ly nang, v nang
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) OR (so sach))) or (co sach)) y nang ma hoi. hieu van cac dac van hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((su sach) OR (so sach))) OR (co sach)) y nang ma hoi. hieu van cac dac van hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((su sach) OR (so sach))) or (co sach)) y nang ma hoi. hieu van cac dac van hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((((su sach) OR (so sach))) or (co sach)) y nang ma hoi. hieu van cac dac van hanh vi cua triet*.