Perhaps you should try some spelling variations:
thanh nhan » thanh phan, thanh san, thanh toan
cach thoi » cac thoi, cach thuc, cach noi
nganh hoa » thanh hoa, khanh hoa, danh hoa
hai thanh » tai thanh, ha thanh, mai thanh
thoi dap » hoi dap, thoi dai, thi dap
nhan dan » phan dau, gian dan, nhan tai
su cach » su sach, tu cach, su cac
mon hoc » toan hoc, dong hoc
mo hoc » co hoc
ma hai » ta hai, va hai, xa hai

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 dap, nghien cuu ((mo hoc) or (mon hoc)) nganh hoa hoc ma hai thanh nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cach thoi dap, nghien cuu ((mo hoc) OR (mon hoc)) nganh hoa hoc ma hai thanh nhan dan.
• Adding a wildcard symbol may retrieve word variants: su cach thoi dap, nghien cuu ((mo hoc) or (mon hoc)) nganh hoa hoc ma hai thanh nhan dan*.