Perhaps you should try some spelling variations:
nghien huy » nghien cuu, nguyen huy, nghiep quy
hanh thoi » hanh thuoc, nhanh thai, hanh noi
thu hanh » thuc hanh, thu thanh, thuy hanh
nhan tai » van tai, toan tai
khoa hoc » hoa hoc
hoc toan » hoc tan, hop toan, hoa toan
toan hoc » van hoc, hoa hoc, tin hoc
huy toan » huy tran, huu toan, huy hoang
thoi dan » thoai dan, hoi dan, thoi dai
hang tai » hang va, dung tai
hai van » thai van, ha van, hai tan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu hanh thoi dan, nghien huy toan hoc toan khoa hoc xa hai van ((nhan tai) or (hang tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu hanh thoi dan, nghien huy toan hoc toan khoa hoc xa hai van ((nhan tai) OR (hang tai)).
• Adding a wildcard symbol may retrieve word variants: thu hanh thoi dan, nghien huy toan hoc toan khoa hoc xa hai van ((nhan tai) or (hang tai))*.