Perhaps you should try some spelling variations:
khac thuong » hoc thuong, phan thuong, pham thuong
sach tien » sach thieu
tien thuc » trien thuc, kien thuc, bien thuc
khoa khac » khoa kham, khoanh khac, khoa hoc
sach tren » sach tranh
pho thong » he thong
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
tren phu » tren phan, tren thuc, bien phu
cac khoi » cac thoi, cac khoan, cach thoi
khoi pho » khoi tho, khoi khoa, hoc pho
te sach » toc sach
tu sach » thu sach, su sach, tu cach
phu cac » phuc cac, pha cac, phu can

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 tien thuc anh khoa khac thuong ) or ( tu sach tren phu cac khoi pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach tien thuc anh khoa khac thuong ) OR ( tu sach tren phu cac khoi pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach tien thuc anh khoa khac thuong ) or ( tu sach tren phu cac khoi pho thong ))*.