Perhaps you should try some spelling variations:
giao hanh » giao thanh, gia hanh, gian thanh
cau treo » cau theo, cau tren, cau triet
thu sach » thuat sach, thuoc sach, thu hoach
cac dac » cac dan, cac dai, cac bac
tu sach » su sach, te sach, tu cach
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
hieu ve » hieu va, hieu van
vi cau » va cau, ve cau, di cau

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)) ky tang xa hoi. hieu ve ((cac dac) or (cac du)) giao hanh vi cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky tang xa hoi. hieu ve ((cac dac) OR (cac du)) giao hanh vi cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky tang xa hoi. hieu ve ((cac dac) or (cac du)) giao hanh vi cau treo".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky tang xa hoi. hieu ve ((cac dac) or (cac du)) giao hanh vi cau treo*.