Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
lang xa » lang ha, dang xay, lang van
hieu va » hieu qua
cam dua » ca dua, cay dua, chay dua
dua ban » dia ban, cua ban, qua ban
lai cua » hai cua, lai chau, thai cua
y lang » o lang, _ lang, tay lang

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 y lang xa hoi. ((hieu va) OR (lieu va)) cam dua ban thanh ((lai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y lang xa hoi. ((hieu va) OR (lieu va)) cam dua ban thanh ((lai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y lang xa hoi. ((hieu va) OR (lieu va)) cam dua ban thanh ((lai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y lang xa hoi. ((hieu va) OR (lieu va)) cam dua ban thanh ((lai cua) or (dai cua)) tre*.