Perhaps you should try some spelling variations:
thuoc dung » hoc dung, thuy dung
dung khoa » dung cho
cao khong » cao phong, cat khong, dao khong
khong khi » khong he
khi thong » khi phong, khi tuong, thi thuong
xa thuoc » va thuoc, na thuoc, xa thuc
sach dao » lanh dao
te sach » toc sach
sach xa » sach nha, sach bai
khoa he » hoa he, khoa hoc, khong he
su sach » so sach, vu sach
dao hoc » dai hoc, dan hoc, day hoc

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 xa thuoc dung khoa he thong ) or ( su sach dao hoc cao khong khi thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach xa thuoc dung khoa he thong ) OR ( su sach dao hoc cao khong khi thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach xa thuoc dung khoa he thong ) or ( su sach dao hoc cao khong khi thong ))*.