Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
thi van » thi lan, thi hanh, thi nang
lai cua » hai cua, lai chau, thai cua
nam da » nam dan, nam a, nam va
da ban » dia ban, dua ban, day ban

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 ma hoa. ((thien van) OR (thi van)) nam da ban thanh ((dai cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoa. ((thien van) OR (thi van)) nam da ban thanh ((dai cua) OR (lai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoa. ((thien van) OR (thi van)) nam da ban thanh ((dai cua) or (lai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoa. ((thien van) OR (thi van)) nam da ban thanh ((dai cua) or (lai cua)) tre*.