Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
tu manh » tu minh, tu hanh, vu manh
tu hach » tu cach, tu hanh, tu sach
van tai » von tai, van tuan
cua co » cua bo, cua cong
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: ((tu manh) or (tu hach)) hoc tap, nghien cua co hoc dan khoa hoc xa hoi va van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu manh) OR (tu hach)) hoc tap, nghien cua co hoc dan khoa hoc xa hoi va van tai.
• Adding a wildcard symbol may retrieve word variants: ((tu manh) or (tu hach)) hoc tap, nghien cua co hoc dan khoa hoc xa hoi va van tai*.