Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien hoat » tien hoa
phan thong » phan thuong, phan hong, phan tong
hoat dung » hoat dong, hoang dung, hoai duong
dung khoa » dung cho
phu thong » pho thong, phap thong, khau thong
tin thuoc » tin thuong, tin hoc, ban thuoc
thuoc anh » thuoc thanh, thuoc dang, thuoc sach
khoa phan » hoa phan, khoa than, khoa phau
khoa phu » khoa phau, khoa thu, hoa phu
sach tin » sach tien, sach kinh, sach tren
anh khoa » doanh khoa, hang khoa
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach trien hoat dung khoa phu thong ) or ( tu sach tin thuoc anh khoa phan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach trien hoat dung khoa phu thong ) OR ( tu sach tin thuoc anh khoa phan thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach trien hoat dung khoa phu thong ) or ( tu sach tin thuoc anh khoa phan thong ))*.