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
van thanh » ban thanh, van tuan
thoi dai » hoc dai, hoi dap, hoi dan
thuoc va » thuc va, thuoc ma, thuong va
su sach » so sach, vu sach
toi tap » toi gap, toan tap, tong tap
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi van » hoi va, hoi dan, hai van
va hoi » xa hoi, va hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((thoi dai) or (toi tap)), nghien cuu mon hoc nganh cong thuoc va hoi van thanh san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thoi dai) OR (toi tap)), nghien cuu mon hoc nganh cong thuoc va hoi van thanh san.
• Adding a wildcard symbol may retrieve word variants: su sach ((thoi dai) or (toi tap)), nghien cuu mon hoc nganh cong thuoc va hoi van thanh san*.