Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
thu xac » thau xay
co sach » bo sach, cuon sach, hoc sach
hieu ve » hieu va, hieu van
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
thu xa » thu ha, thu xe, thu ba
ve cac » va cac, vien cac

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

• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ((ty nang) OR (ty hang)) ma hoa. hieu ve cac ((thu xa) OR (thu xac)) hanh lai su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ((ty nang) OR (ty hang)) ma hoa. hieu ve cac ((thu xa) or (thu xac)) hanh lai su triet~".
• Adding a wildcard symbol may retrieve word variants: co sach ((ty nang) OR (ty hang)) ma hoa. hieu ve cac ((thu xa) or (thu xac)) hanh lai su triet*.