Perhaps you should try some spelling variations:
hoach hoi » hoc hoi, hoach ha, sach hoi
hoc thanh » hoc nhanh, hoan thanh, hoc phan
sach doi » sach hoi, sach moi, sach dao
cong hoc » dong hoc, cong hoa, cong coc
cua nhan » ca nhan, cua ngan, cua nha
nhan van » nhan dan, nhan va, phan van
hoi cua » hoi chuc
cuu co » huu co, cua co, cuu mo
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: so ((hoach hoi) or (sach doi)) tap, nghien cuu co hoc thanh cong hoc xa hoi cua nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((hoach hoi) OR (sach doi)) tap, nghien cuu co hoc thanh cong hoc xa hoi cua nhan van.
• Adding a wildcard symbol may retrieve word variants: so ((hoach hoi) or (sach doi)) tap, nghien cuu co hoc thanh cong hoc xa hoi cua nhan van*.