Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
tu sach » thu sach, su sach, te sach
co sach » bo sach, cuon sach, hoc sach
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (co sach)) ky nang x hoi. hieu ((ve cam) OR (ve cac)) thuc day hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (co sach)) ky nang x hoi. hieu ((ve cam) OR (ve cac)) thuc day hanh vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (co sach)) ky nang x hoi. hieu ((ve cam) OR (ve cac)) thuc day hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (co sach)) ky nang x hoi. hieu ((ve cam) OR (ve cac)) thuc day hanh vi cua triet*.