Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
cac cua » cach cua, cac qua, ca cua
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ty lang » tay lang, ty hang, tu lang
ve cac » va cac, vien cac

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 ((ty lang) OR (ty xang)) xa hoi. hieu ve cac cua ban hanh vai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty lang) OR (ty xang)) xa hoi. hieu ve cac cua ban hanh vai ((cua tre) OR (su triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty lang) OR (ty xang)) xa hoi. hieu ve cac cua ban hanh vai ((cua tre) or (su triet))*".