Perhaps you should try some spelling variations:
hoach hoc » hoach hoi, hoach hoa, hoa hoc
tu hoach » thu hoach, tu hach, quy hoach
san khoa » toan khoa, hang khoa, da khoa
khoa hoc » hoa hoc
nhan van » nhan dan, nhan va, phan van
hoc san » hoc dan, toc san, hoc can
hoi cac » hoc cac, voi cac, hoa cac
cuu co » huu co, cua co, cuu mo
hoi ca » hoi cua, hoi cau, hoi va

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