Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
bach khang » bac thang, bach dang
bai thuat » giai thuat, bai thuyet, ki thuat
sach khoa » bach khoa, sach nha, anh khoa
sach bai » cac bai, sach xa
khoa pho » khoa phu, khoa khoa, khoa phau
sach dao » lanh dao
dao truc » dao tuc, dao tru, dai truc
khang he » khong he, khang kho, hang ha
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 bai thuat sach khoa pho thong ) or ( te sach dao truc bach khang he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach bai thuat sach khoa pho thong ) OR ( te sach dao truc bach khang he thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach bai thuat sach khoa pho thong ) or ( te sach dao truc bach khang he thong ))*.