Perhaps you should try some spelling variations:
chanh tranh » canh tranh, hanh trinh, nhanh thanh
tranh thuoc » thanh phuoc, trang thuc, hanh thuoc
thuoc sach » hoc sach, nuoc sach, thuat sach
thuoc dang » thuoc dung, thuoc khang, thuc dan
khoa thong » hoa thong, thoai thong, pho thong
dao thuoc » cao thuoc, tao thuoc, dang thuoc
sach khoa » bach khoa, sach nha, anh khoa
hoc thong » hoc thuong, hoc trong, hoc hong
sach dao » lanh dao
khoa hoc » hoa hoc
tu chanh » tu hanh, tu thanh, tu chung
dang hoc » dong hoc, dan hoc, dung hoc
hoc khoa » hoc pho
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 dao thuoc sach khoa hoc thong ) or ( tu chanh tranh thuoc dang hoc khoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dao thuoc sach khoa hoc thong ) OR ( tu chanh tranh thuoc dang hoc khoa thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dao thuoc sach khoa hoc thong ) or ( tu chanh tranh thuoc dang hoc khoa thong ))*.