Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
doanh khoa » toan khoa
cac khoang » cac khoan, tao khoang, cac phong
khoang thi » khoang thoi, hoang thi, hoang thai
khoa khau » khoa kham, khoa phau, khoa chau
thi thong » thi thuong, thi hong, thi khong
sach tri » sach tai, sach tren, sach truc
le doanh » ly doanh, le danh, le doan
sach thu » sach thue, sach thieu, sach tham
thu thuc » thuc thuc, thu thuoc, thue thuc
thuc cac » thuc cach, tuc cac, phuc cac
te sach » toc sach
tu sach » thu sach, su sach, tu cach
tri le » thi le, tri lieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach tri le doanh khoa khau thong ) or ( tu sach thu thuc cac khoang thi thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tri le doanh khoa khau thong ) OR ( tu sach thu thuc cac khoang thi thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tri le doanh khoa khau thong ) or ( tu sach thu thuc cac khoang thi thong ))*.