Perhaps you should try some spelling variations:
hoan thanh » hoang thanh, ban thanh, van thanh
hoc thanh » hoc nhanh, hoc phan, ha thanh
van phan » van phong, van thanh, luan phan
phan dau » phan tu, hang dau
tu bach » vu bach, tu cach, tu bac
mai tap » bai tap, mai tat, mai tan
hoi van » hoi va, hoi dan, hai van
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 bach mai tap, nghien cuu mo ((hoc thanh) OR (hoan thanh)) hoa hoc xa hoi van phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu bach mai tap, nghien cuu mo ((hoc thanh) OR (hoan thanh)) hoa hoc xa hoi van phan dau".
• Adding a wildcard symbol may retrieve word variants: tu bach mai tap, nghien cuu mo ((hoc thanh) OR (hoan thanh)) hoa hoc xa hoi van phan dau*.