Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, toan doanh
ban danh » ban hanh, ban dan, van danh
tu sach » thu sach, su sach, te sach
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
hai cua » thai cua, dai cua, hoi cua
cua te » cua tu

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 hoach)) ty hang xa hoi. hieu qua cac xuc ((ban danh) OR (ban doanh)) hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ty hang xa hoi. hieu qua cac xuc ((ban danh) OR (ban doanh)) hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) ty hang xa hoi. hieu qua cac xuc ((ban danh) OR (ban doanh)) hai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ty hang xa hoi. hieu qua cac xuc ((ban danh) OR (ban doanh)) hai cua te*.