Perhaps you should try some spelling variations:
hoach trien » hoach chien
trien thuc » trien thuoc, tren thuc, trien thuat
thuoc sanh » thuoc sach, thuoc sinh, thuoc san
sanh trong » sinh trong, anh trong, hanh trong
trong truc » trong thuc, trong tuc, trang truc
khoa thong » hoa thong, thoai thong, khoi khong
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » cac khoa, cac khoan, anh khoa
pho thong » he thong
bach khoa » anh khoa
khoa khoa » hoa khoa, khuan khoa, khoa hoc
khoa pho » khoa phu, khoa phau, khoa hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hoach trien thuc cach khoa pho thong ) or ( thuoc sanh trong truc bach khoa khoa thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach trien thuc cach khoa pho thong ) OR ( thuoc sanh trong truc bach khoa khoa thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach trien thuc cach khoa pho thong ) or ( thuoc sanh trong truc bach khoa khoa thong ))*.