Perhaps you should try some spelling variations:
xanh khong » nganh khong, anh thong, benh khong
phau thong » phap thong, khau thong, phan thong
sach tham » sach nha
bach khoa » anh khoa
khoa phau » hoa phan, khoa kham, khoa than
tren thuc » trien thuc, tron thuc, trinh thuc
thuc xanh » thuc hanh, thuc thanh, thuc dan
tham tuc » tham thuc, thai tuc, nham thuc
tuc bach » truc bach, trac bach, tuc cac
cac tren » ca tren, cau tren, rac tren
khong he » khong khi, hong ha, khong _
su sach » so sach, vu sach

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 tham tuc bach khoa phau thong ) or ( tu cac tren thuc xanh khong he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tham tuc bach khoa phau thong ) OR ( tu cac tren thuc xanh khong he thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tham tuc bach khoa phau thong ) or ( tu cac tren thuc xanh khong he thong ))*.