Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
chat duc » chat xuc, chat doc, chet duoc
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
duc ban » duc tan, duc van, dua ban
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
ve cua » de cua, te cua, ve cum
le cua » ly cua

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) or (thu sach)) ly nang x ho. hieu va chat duc ban thanh ((ve cua) OR (le cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ly nang x ho. hieu va chat duc ban thanh ((ve cua) OR (le cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ly nang x ho. hieu va chat duc ban thanh ((ve cua) OR (le cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ly nang x ho. hieu va chat duc ban thanh ((ve cua) OR (le cua)) tre*.