Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
tu sach » thu sach, su sach, te sach
cam duc » cam xuc, cao duc, pham duc
hai cuc » tai cuc, hai cua, thai cua
hai cuu » hai cua, hai chu, thai cua
duc ban » duc tan, duc van, dua ban
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
tang ma » mang may, tang van
va cam » va cham, va cac, va cao

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 ((tang ma) or (lang xa)) hoi. hieu va cam duc ban thanh ((hai cuu) OR (hai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((tang ma) OR (lang xa)) hoi. hieu va cam duc ban thanh ((hai cuu) OR (hai cuc)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((tang ma) or (lang xa)) hoi. hieu va cam duc ban thanh ((hai cuu) OR (hai cuc)) tre*".