Perhaps you should try some spelling variations:
nhan khong » nhan thong, nhanh chong, nganh khong
nang tren » hang tren, lang tren, tang tren
tren nhan » trien nhan, tran nhan, tren phan
khong hoc » khung hoc, thong hoc, khong thuoc
sach hoi » sach doi, sach moi, cach thoi
cuu nang » chuc nang, cam nang, cuu van
phan van » pham van, thanh van, luan van
gian dan » gian lang
tu sach » thu sach, su sach, te sach
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 sach hoi trac, nghien cuu nang tren nhan khong hoc xa hoi va ((phan van) or (gian dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoi trac, nghien cuu nang tren nhan khong hoc xa hoi va ((phan van) OR (gian dan)).
• Adding a wildcard symbol may retrieve word variants: tu sach hoi trac, nghien cuu nang tren nhan khong hoc xa hoi va ((phan van) or (gian dan))*.