Perhaps you should try some spelling variations:
khong thong » thong thong, khong trong, thong thuong
thuc thuoc » thuc thuc, truc thuoc, thu thuoc
cach thuc » anh thuc, cac thu
thuoc ban » thuoc tan, thuoc dang, thu ban
tue hoach » ke hoach, quy hoach, thu hoach
hoach hoa » hoach ha, hoach hoi, hoach toan
hoa khong » khoi khong, hoa cong, he khong
ban khoa » san khoa, van khoa, ba khoa
tu cach » tu cac
khoa he » hoa he, khoa hoc, khong he
bai tue » bai tu
su cac » tu cac, su cao, su can

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 thuc thuoc ban khoa he thong ) or ( su cac bai tue hoach hoa khong thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cach thuc thuoc ban khoa he thong ) OR ( su cac bai tue hoach hoa khong thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cach thuc thuoc ban khoa he thong ) or ( su cac bai tue hoach hoa khong thong ))*.