Perhaps you should try some spelling variations:
than thong » than thuong, toan thong, tran thong
phan tong » phan trong, phan cong, han tong
hoat phan » hoa phan, thuat phan, hoc phan
sach tham » sach nha
tham khoa » pham khoa, thai khoa, tham hoa
khoa sach » hoc sach
sach khoa » bach khoa, sach nha, anh khoa
khoa than » khoa luan, hoa thai, hoa tan
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
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 tong ) or ( te sach tham khoa sach khoa than thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach dao thuc cac hoat phan tong ) OR ( te sach tham khoa sach khoa than thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach dao thuc cac hoat phan tong ) or ( te sach tham khoa sach khoa than thong ))*.