Perhaps you should try some spelling variations:
khan thong » khap thong, khau thong, nhan thong
phan cong » thanh cong
hoat phan » hoa phan, thuat phan, hoc phan
sach tham » sach nha
sach dao » lanh dao
dao thuc » dan thuc, dao tuc, do thuc
thuc cac » thuc cach, tuc cac, phuc cac
cac hoat » cao hoat, cac khoan, cac thuat
tham hoi » tham hoa, cham hoi, pham hoai
hoi sach » hoc sach, moi sach, hoa sach
sach kho » bach khoa, sach nha, sach kem
kho khan » khoa kham, khoa than
te sach » toc sach

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 dao thuc cac hoat phan cong ) or ( te sach tham hoi sach kho khan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach dao thuc cac hoat phan cong ) OR ( te sach tham hoi sach kho khan thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach dao thuc cac hoat phan cong ) or ( te sach tham hoi sach kho khan thong ))*.