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