Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, cac khoan
khoa khau » khoa kham, khoa phau, khoa chau
hoach tri » hoach toi, hoach hoi, hoach thu
hanh khoa » hang khoa, anh khoa, hanh hoa
hoc thong » hoc thuong, hoc trong, hoc hong
sanh tri » thanh tri, dinh tri, minh tri
tri thuc » tri tue
thi hanh » thi thanh
khoa hoc » hoa hoc
so sanh » do sanh
tri thi » tri tai, tai thi, thi thi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sanh tri thuc cach khoa khau thong ) or ( thu hoach tri thi hanh khoa hoc thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tri thuc cach khoa khau thong ) OR ( thu hoach tri thi hanh khoa hoc thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tri thuc cach khoa khau thong ) or ( thu hoach tri thi hanh khoa hoc thong ))*.