Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
tham xuc » tham nuoc, tham thuc, pham duc
va tham » van tham, va cham, va thanh
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
xuc ban » duc ban, cuc ban, quoc ban
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((nang xa) or (nang ma)) hoi. hieu va tham xuc ban hanh ((hai cua) OR (hoi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (nang ma)) hoi. hieu va tham xuc ban hanh ((hai cua) OR (hoi cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang xa) or (nang ma)) hoi. hieu va tham xuc ban hanh ((hai cua) OR (hoi cua)) te".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang xa) or (nang ma)) hoi. hieu va tham xuc ban hanh ((hai cua) OR (hoi cua)) te*.