Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
cong thuoc » cong thuc, dong thuoc, long thuoc
hoc nganh » hoc nhanh
thanh van » thanh san, thanh toan, thanh phan
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
thuoc ma » hoc ma, duoc ma
hoc van » hoc dan, hoc va, hoc phan
hoc vat » hoc va, hoc viet, thuc vat

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 ma ((hoc van) OR (hoc vat)) thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu mach hoc tap, nghien cuu toan hoc nganh cong thuoc ma ((hoc van) OR (hoc vat)) thanh van".
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cuu toan hoc nganh cong thuoc ma ((hoc van) OR (hoc vat)) thanh van*.