Perhaps you should try some spelling variations:
kham thong » khap thong, khau thong, pham thuong
khoan kham » khoa kham, khoanh khac, khoan cam
sach tham » sach nha
tham thuc » nham thuc, pham thuc, tam thuc
hoc thong » hoc thuong, hoc trong, hoc hong
tri truoc » tri thuoc, tri thuc, gi truoc
truoc cac » truoc cach, truoc cang, truoc cuoc
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoi, dac khoa, cao khoa
khoa hoc » hoa hoc
cach tri » cach thoi, cac tro, cach noi
su sach » so sach, vu sach
tu cach » tu cac

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 thuc cac khoa hoc thong ) or ( tu cach tri truoc cac khoan kham thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tham thuc cac khoa hoc thong ) OR ( tu cach tri truoc cac khoan kham thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tham thuc cac khoa hoc thong ) or ( tu cach tri truoc cac khoan kham thong ))*.