Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
trinh thuc » trinh tu, trinh thi
cao khoan » cac khoan, cao khoa, tao khoang
khoan hoa » khoan hoi, khoan nhoi, khanh hoa
hoa khong » khoi khong, hoa cong, he khong
sach tham » sach nha
tham phuc » pham phuc, tham thuc, thuat phuc
hoc khong » hoc hong, khoi khong, hoc thuong
thuc cao » thuoc cao, thuc co, thuc can
phuc cac » phuc cam, phuc ca, phuc cham
cac khoa » cac khoan, cac khoi, dac khoa
khoa hoc » hoa hoc
te sach » toc sach

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 trinh thuc cao khoan hoa khong ) or ( te sach tham phuc cac khoa hoc khong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach trinh thuc cao khoan hoa khong ) OR ( te sach tham phuc cac khoa hoc khong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach trinh thuc cao khoan hoa khong ) or ( te sach tham phuc cac khoa hoc khong ))*.