Perhaps you should try some spelling variations:
hanh khuan » khang khuan, khanh thuan, anh chuan
khau thong » khau thuong, khap thong, khau tong
cong khoa » cong hoa, con khoa, dong khoa
khoa khau » khoa kham, khoa phau, khoa chau
khoa thon » khoa than, hoa thon, khoa thuoc
sach dao » lanh dao
thi cong » tai cong, thien cong
thi hanh » thi thanh
so sach » so sanh, bo sach, co sach
dao thi » do thi, dan thi, dang thi
hanh do » thanh do, hanh dao, hanh de
do thuc » hoc thuc, dan thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach dao thi cong khoa khau thong ) or ( thi hanh do thuc hanh khuan khoa thon ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach dao thi cong khoa khau thong ) OR ( thi hanh do thuc hanh khuan khoa thon )).
• Adding a wildcard symbol may retrieve word variants: (( so sach dao thi cong khoa khau thong ) or ( thi hanh do thuc hanh khuan khoa thon ))*.