Perhaps you should try some spelling variations:
sach tranh » canh tranh
tranh thuc » trinh thuc, trang thuc, thanh thuy
khoan phau » khoa phau, khoan phai, khoa chau
phau thong » phap thong, khau thong, phan thong
sach khoa » bach khoa, sach nha, anh khoa
pho thong » he thong
sach tai » sach bai, sach tham, sach dao
khoa pho » khoa phu, khoa khoa, khoa phau
thuc cac » thuc cach, tuc cac, phuc cac
su sach » so sach, vu sach
te sach » toc sach
ngan » nganh, nhan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach tai ngan sach khoa pho thong ) or ( te sach tranh thuc cac khoan phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tai ngan sach khoa pho thong ) OR ( te sach tranh thuc cac khoan phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tai ngan sach khoa pho thong ) or ( te sach tranh thuc cac khoan phau thong ))*.