Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
cau treo » cau theo, cau tren, cau triet
hieu ve » hieu va, hieu van
cac dai » cac dan, cac bai, can dai
ty lang » tay lang, ty hang, tu lang
dai va » mai va
ve cac » va cac, vien cac

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 lang) OR (ty xang)) xa hoi. hieu ve cac dai va ((hanh tai) or (thanh san)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty lang) OR (ty xang)) xa hoi. hieu ve cac dai va ((hanh tai) OR (thanh san)) cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty lang) OR (ty xang)) xa hoi. hieu ve cac dai va ((hanh tai) or (thanh san)) cau treo".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty lang) OR (ty xang)) xa hoi. hieu ve cac dai va ((hanh tai) or (thanh san)) cau treo*.