Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van anh » van thanh, tuan anh, van minh
anh lai » anh bai, anh tai, gianh lai
nang o » nang co, nang ho, nang ro
ve bac » ve ban, he bac, va bac
ve bao » te bao, va bao
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hai

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 ky nang o hoi. hieu ((((ve bac) OR (ve bao))) or (ve cac)) vo van anh lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. hieu ((((ve bac) OR (ve bao))) OR (ve cac)) vo van anh lai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hoi. hieu ((((ve bac) OR (ve bao))) or (ve cac)) vo van anh lai su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu ((((ve bac) OR (ve bao))) or (ve cac)) vo van anh lai su triet*.