Perhaps you should try some spelling variations:
sanh tri » thanh tri, dinh tri, minh tri
tue cach » tu cach, thuc cach, ve cach
cach hoc » cach thuc, cach thoi, dich hoc
he trong » he thong, he trung, le trong
sach tri » sach tren, sach truc, sach bai
sach tai » sach bai, sach tham, sach dao
thanh ta » thanh tra, thanh tai, thanh tay
so sanh » do sanh
hoc he » hoc hien
ta he » tao he, tai he, ta ha

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 tue cach hoc he trong ) or ( so ((sach tri) or (sach tai)) thi thanh ta he trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tri tue cach hoc he trong ) OR ( so ((sach tri) OR (sach tai)) thi thanh ta he trong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tri tue cach hoc he trong ) or ( so ((sach tri) or (sach tai)) thi thanh ta he trong ))*.