Perhaps you should try some spelling variations:
sanh trong » sinh trong, anh trong, hanh trong
khan thong » khap thong, khau thong, nhan thong
trong thuc » trong thu, thuong thuc, trong thuat
chat thong » chat chong, chat phong, chat trong
cach thuc » anh thuc, cac thu
thuc cach » thuoc sach, truoc cach, thuc hanh
thuc tue » thuc te, thuc que, thuc tre
kho khan » khoa kham, khoa than
cach hoc » cach thoi, dich hoc, cac hop
hoc chat » hoc phat, hoc cao, hoc phan
te cach » ve cach, te sach, tu cach
tue cac » tu cac, tuc cac, te cac
cac kho » cac khoi, cac khoa, cac khu
te sanh » te danh, te sach, te san

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

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