Perhaps you should try some spelling variations:
tieu doanh » tieu danh, trien doanh, dieu danh
doanh khoa » toan khoa
sach tren » sach tien, sach tranh
tren tuan » tran tuan, trung tuan, tren trang
tuan bang » tuan dang, tuan hoang, thuat bang
phuong ke » phuong te, phuong de, phuong yen
hoach bai » hoach bang, hoc bai, sach bai
hoc trong » hoc thuong, hoc tieng, dot trong
ke thong » ke thuong, kem thong, he thong
bai tieu » ai tieu, dai tieu, tai tieu
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te sach

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 tren tuan bang phuong ke thong ) or ( thu hoach bai tieu doanh khoa hoc trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tren tuan bang phuong ke thong ) OR ( thu hoach bai tieu doanh khoa hoc trong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tren tuan bang phuong ke thong ) or ( thu hoach bai tieu doanh khoa hoc trong ))*.