Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
dat tren » dat trong, dua tren
tu sach » thu sach, su sach, tu cach
te sach » toc sach
qua cau » quan cau, qua cac, qua ca
cau tuc » cau truc, cau tu, cau luc
va doan » van doan, va dan, va don
vi dat » voi dat, vi dai, va dat

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 (te sach)) ky nang x ho. hieu qua cau tuc ((va doan) OR (va doanh)) vi dat tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang x ho. hieu qua cau tuc ((va doan) OR (va doanh)) vi dat tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang x ho. hieu qua cau tuc ((va doan) OR (va doanh)) vi dat tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang x ho. hieu qua cau tuc ((va doan) OR (va doanh)) vi dat tren*.