Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
kham thong » khap thong, khau thong, pham thuong
trinh phan » trinh han, trinh quan, thanh phan
sach tien » sach tren, sach thieu
tien thuc » trien thuc, kien thuc, bien thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
khoa kham » kho khan, khoa than
hoc thong » hoc thuong, hoc trong, hoc hong
phan cac » nhan cach, phan dau, phan lap
cac khoa » cac khoan, cac khoi, dac khoa
khoa hoc » hoa hoc
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 tien thuc hanh khoa kham thong ) or ( tu sach trinh phan cac khoa hoc thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tien thuc hanh khoa kham thong ) OR ( tu sach trinh phan cac khoa hoc thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tien thuc hanh khoa kham thong ) or ( tu sach trinh phan cac khoa hoc thong ))*.