Perhaps you should try some spelling variations:
thuyet mach » thuyet xac, thuyet cac, thuyet anh
thuat tach » thuat sach, thuat mach, thuat tac
nghien huu » nghien cuu, nguyen huu, nhiem huu
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
khoa hoc » hoa hoc
phan van » pham van, thanh van, luan van
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
va phan » van phan, va phat, va phap
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuyet mach) or (thuat tach)) hoc tap, nghien huu mot hoc doanh khoa hoc xa hoi va phan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuyet mach) OR (thuat tach)) hoc tap, nghien huu mot hoc doanh khoa hoc xa hoi va phan van.
• Adding a wildcard symbol may retrieve word variants: ((thuyet mach) or (thuat tach)) hoc tap, nghien huu mot hoc doanh khoa hoc xa hoi va phan van*.