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