Perhaps you should try some spelling variations:
sanh trong » sinh trong, anh trong, hanh trong
trong thuc » trong thu, thuong thuc, trong thuat
khoan khoa » khuan khoa, khoa khoa, toan khoa
khoa thong » hoa thong, thoai thong, pho thong
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoa, anh khoa
hoc thong » hoc thuong, hoc trong, hoc hong
truoc cac » truoc cach, truoc cang, truoc cuoc
khoa hoc » hoa hoc
gi truoc » gian truoc, _ truoc
tu sanh » tu hanh, tu manh, tu san
vu kham » vu khanh
kham gi » tham gia, khan gia, pham gia

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sanh trong thuc cach khoa hoc thong ) or ( vu kham gi truoc cac khoan khoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sanh trong thuc cach khoa hoc thong ) OR ( vu kham gi truoc cac khoan khoa thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sanh trong thuc cach khoa hoc thong ) or ( vu kham gi truoc cac khoan khoa thong ))*.