Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
doanh khoa » toan khoa
pho thong » he thong
sach tren » sach tien, sach tranh
hang khoa » dung khoa
khoa khau » khoa kham, khoa phau, khoa chau
sach dao » lanh dao
tu doanh » su doanh, te doanh, ty doanh
khoa pho » khoa phu, khoa khoa, khoa phau
tren tue » tren que, tren thuc, tri tue
tue hang » te hang, lue zhang, thuy hang
tu sach » thu sach, su sach, te sach
dao tu » dao tuc, dao tru, tao tu

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 tu doanh khoa pho thong ) or ( tu sach tren tue hang khoa khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dao tu doanh khoa pho thong ) OR ( tu sach tren tue hang khoa khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dao tu doanh khoa pho thong ) or ( tu sach tren tue hang khoa khau thong ))*.