Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van doanh » toan doanh, van dong, van thanh
duoc tren » nuoc tren, thuoc tren, dung tren
sang tao » hang tai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va doanh » vay doanh, va danh, hoa doanh
tai duoc » tao duoc, tan duoc, mai duoc
sach ty » sach y, sach tu, sach thu
ty sang » ty xang, ty hang, duy sang
tao hoi » tao khoi, tao boi, tay hoi
hieu va » lieu va, hieu qua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ty sang tao hoi. hieu va cac nuoc ((va doanh) or (van doanh)) tai duoc tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty sang tao hoi. hieu va cac nuoc ((va doanh) OR (van doanh)) tai duoc tren.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty sang tao hoi. hieu va cac nuoc ((va doanh) or (van doanh)) tai duoc tren*.