Perhaps you should try some spelling variations:
thanh phong » thanh phuong, khanh phong, thanh hong
nghien cua » nghien cuu, nghiep cua, nghiep vua
thuoc hoc » thuoc ho, thuoc nhom, thuong hoc
hoc thanh » hoc nhanh, hoan thanh, hoc phan
phong hoc » phong ho, thong hoc, phuong hoa
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van nhan » van phan, van thanh, danh nhan
nhan dan » phan dau, gian dan, nhan tai
hoc sach » hoc sinh, hoc cac, hoc anh
hai van » thai van, ha van, hai tan
su sach » so sach, vu sach
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: ((su sach) or (hoc sach)) hoc tap, nghien cua thuoc hoc thanh phong hoc xa hai van nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (hoc sach)) hoc tap, nghien cua thuoc hoc thanh phong hoc xa hai van nhan dan*.