Perhaps you should try some spelling variations:
hoach hoi » hoc hoi, hoach ha, sach hoi
tu hoach » thu hoach, tu hach, quy hoach
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
nhan van » nhan dan, nhan va, phan van
hoi tap » hoi dap, hoc tap, hoi tai
mai hoi » mai khoi, dai hoi, lai hoi
cuu co » huu co, cua co, cuu mo
ma hoi » xa hoi, ma hoa, me hoi

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 co hoc dan khoa hoc ((ma hoi) OR (mai hoi)) ca nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu hoach hoi tap, nghien cuu co hoc dan khoa hoc ((ma hoi) OR (mai hoi)) ca nhan van".
• Adding a wildcard symbol may retrieve word variants: tu hoach hoi tap, nghien cuu co hoc dan khoa hoc ((ma hoi) OR (mai hoi)) ca nhan van*.