Perhaps you should try some spelling variations:
trien thuoc » trien thuc, trien thuong, tin thuoc
thuoc duong » thuoc dung, thuoc dong, thuy duong
thuat doanh » thuat toan, luat doanh, thuat lanh
sach trien » sach tien, sach tren, sach thieu
duong khoa » dung khoa, luong khoa
phau thong » phap thong, khau thong, phan thong
doanh khoa » toan khoa
khoa phau » hoa phan, khoa kham, khoa than
pho thong » he thong
ki thuat » ky thuat
khoa pho » khoa phu, khoa khoa, khoa hoc
tu sach » thu sach, su sach, te sach
sach ki » sach kinh, sach bai, sach kem

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 thuoc duong khoa phau thong ) or ( tu sach ki thuat doanh khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach trien thuoc duong khoa phau thong ) OR ( tu sach ki thuat doanh khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach trien thuoc duong khoa phau thong ) or ( tu sach ki thuat doanh khoa pho thong ))*.