Perhaps you should try some spelling variations:
phan thanh » ban thanh, van thanh, quan thanh
khung hoc » chung hoc, nhung hoc, thuong hoc
sach hoi » sach doi, sach moi, cach thoi
cuu tong » cuu cong, cuu tinh, huu tung
vu sach » vu bach, su sach, vu khach
hoi tai » hoc tai, hoi trac
va phan » van phan, va phat, va phap
phan va » phan van, nhan va, han va
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: vu sach hoi tai, nghien cuu tong ((phan thanh) or (pham thanh)) khung hoc xa hoi va phan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach hoi tai, nghien cuu tong ((phan thanh) OR (pham thanh)) khung hoc xa hoi va phan va.
• Adding a wildcard symbol may retrieve word variants: vu sach hoi tai, nghien cuu tong ((phan thanh) or (pham thanh)) khung hoc xa hoi va phan va*.