Perhaps you should try some spelling variations:
thue nang » thien nang, thuat nang, thi nang
doanh ban » doanh bat, doanh van, doanh nhan
dau tren » dau tien, dat tren, dau tieng
thu sach » thuat sach, thuoc sach, thu hoach
ban dau » bat dau, ban dan, van dau
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va pham » van pham, va phat, va phap
duy va » duy van, day va, duy v

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)) thue nang xa hoi. hieu va pham ((duy va) or (duy vat)) doanh ban dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) thue nang xa hoi. hieu va pham ((duy va) OR (duy vat)) doanh ban dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) thue nang xa hoi. hieu va pham ((duy va) or (duy vat)) doanh ban dau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) thue nang xa hoi. hieu va pham ((duy va) or (duy vat)) doanh ban dau tren*.