Perhaps you should try some spelling variations:
cong thuoc » dong thuoc, long thuoc, cong thuong
thanh phan » thanh pho, thanh san, thanh toan
hoc nganh » hoc nhanh
cong thuc » cong tac
van thanh » ban thanh, van tuan
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
hoc van » hoc dan, hoc va, hoc vat
va hoc » van 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 mach hoc tap, nghien cuu toan hoc nganh ((cong thuoc) OR (cong thuc)) va hoc van thanh phan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu mach hoc tap, nghien cuu toan hoc nganh ((cong thuoc) OR (cong thuc)) va hoc van thanh phan".
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cuu toan hoc nganh ((cong thuoc) OR (cong thuc)) va hoc van thanh phan*.