Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
nhanh khong » nhanh chong, nganh khong, nhan khong
hoc nhanh » hoc nganh, hoc phan
thoi tap » toi tap, thoi dai, hoi tai
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
thuoc va » thuc va, thuoc ma, thuong va
nhan dan » phan dau, gian dan, nhan tai
su cach » su sach, tu cach, su cac
va nhan » van nhan, ca nhan, va phan
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 cach ((thoi tap) OR (hoc tap)), nghien cuu cong hoc nhanh khong thuoc va hoi va nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cach ((thoi tap) OR (hoc tap)), nghien cuu cong hoc nhanh khong thuoc va hoi va nhan dan".
• Adding a wildcard symbol may retrieve word variants: su cach ((thoi tap) OR (hoc tap)), nghien cuu cong hoc nhanh khong thuoc va hoi va nhan dan*.