Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
phap duc » pham duc, phan duc, phap doc
than cua » nhan cua, ban cua, gian cua
thai cua » tai cuc, tri cua, dai cua
thu hang » thi hang, thuc hanh, thu huong
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
va phap » va phat, ban phap
tu hanh » du hanh, lu hanh, thuc hanh

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 ((tu hanh) or (thu hang)) xa hoi. lieu va phap duc ban thanh ((thai cua) OR (than cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu hanh) OR (thu hang)) xa hoi. lieu va phap duc ban thanh ((thai cua) OR (than cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu hanh) or (thu hang)) xa hoi. lieu va phap duc ban thanh ((thai cua) OR (than cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu hanh) or (thu hang)) xa hoi. lieu va phap duc ban thanh ((thai cua) OR (than cua)) tre*.