Perhaps you should try some spelling variations:
khan thong » khap thong, khau thong, nhan thong
pho thong » he thong
cach tri » cach thoi, cac tro, cach noi
tri thuc » tri tue
hanh kho » hanh khu, hang khoa, hanh theo
kho khan » khoa kham, khoa than
thuc anh » thuy anh, thu anh, thuc thanh
anh khoa » doanh khoa, hang khoa
khoa pho » khoa phu, khoa khoa, khoa phau
tu cach » tu cac
hoc cac » hoc cao
cac tri » cac tro, cac toi, cac thi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cach tri thuc hanh kho khan thong ) or ( hoc cac tri thuc anh khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach tri thuc hanh kho khan thong ) OR ( hoc cac tri thuc anh khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cach tri thuc hanh kho khan thong ) or ( hoc cac tri thuc anh khoa pho thong ))*.