Perhaps you should try some spelling variations:
canh khoa » anh khoa, xanh khoa, doanh khoa
sach hoc » cach hoc, mach hoc, sach duoc
sach hoi » sach doi, sach moi, cach thoi
cuu nang » chuc nang, cam nang, cuu van
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
nhan van » nhan dan, nhan va, phan van
hoa van » hoa dan, hoang van, hoa phan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach hoc) OR (sach hoi)) tap, nghien cuu nang luc canh khoa hoc ma hoa van nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach hoc) OR (sach hoi)) tap, nghien cuu nang luc canh khoa hoc ma hoa van nhan van".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach hoc) OR (sach hoi)) tap, nghien cuu nang luc canh khoa hoc ma hoa van nhan van*.