Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
khoan khau » khoanh khac, khoa kham, khoa phau
chuc danh » chuc nganh, thuc hanh, chuc nang
danh khoa » doanh khoa, anh khoa, danh hoa
pho thong » he thong
sach tai » sach bai, sach tham, sach dao
tai chuc » tai cuc, toi chuc, tai chung
khoa pho » khoa phu, khoa khoa, khoa phau
sach dat » sach dao, sach danh, sach bai
tu sach » thu sach, su sach, te sach
phu cac » phuc cac, pha cac, phu can

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 tai chuc danh khoa pho thong ) or ( tu sach dat phu cac khoan khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tai chuc danh khoa pho thong ) OR ( tu sach dat phu cac khoan khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tai chuc danh khoa pho thong ) or ( tu sach dat phu cac khoan khau thong ))*.