Perhaps you should try some spelling variations:
hoach hoi » hoc hoi, hoach ha, sach hoi
hang khoa » dung khoa
tu hoach » thu hoach, tu hach, quy hoach
hoc hang » hoc hanh, hoc bang, hoc tang
khoa hoc » hoa hoc
nhan van » nhan dan, phan van, nha van
hoi tap » hoi dap, hoc tap, hoi tai
nhan va » nhan tai, nhan dan, nhan tao
mo hoc » mon hoc, co hoc
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 hoach hoi tap, nghien cuu mo hoc hang khoa hoc xa hoi va ((nhan van) or (nhan va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu hoach hoi tap, nghien cuu mo hoc hang khoa hoc xa hoi va ((nhan van) OR (nhan va)).
• Adding a wildcard symbol may retrieve word variants: tu hoach hoi tap, nghien cuu mo hoc hang khoa hoc xa hoi va ((nhan van) or (nhan va))*.