Perhaps you should try some spelling variations:
pham thuong » phan thuong, pham hong
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa pham » khoa kham, khoa phau, khoa cham
sach kien » sach tien, mach dien, sach kinh
sach dai » sach dao, sach bai, sach dat
thu hanh » thuc hanh, thu thanh, thuy hanh
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoan, cac khoi, dac khoa
khoa hoc » hoa hoc
hoc hong » hoc huong, hoc khong, hoc cong
tu sach » thu sach, su sach, te sach
dai thu » dai thua, dai thuc, doi thu

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 dai thu hanh khoa pham thuong ) or ( tu sach kien thuc cac khoa hoc hong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dai thu hanh khoa pham thuong ) OR ( tu sach kien thuc cac khoa hoc hong ))*.