Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cuu cong » cua cong, thu cong, cac cong
cong coc » cong cuoc, cong cac, cong co
coc phan » co phan, hoc phan, cac phan
phan hoa » phan loai, phan phoi, phan hong
nang dau » hang dau, xang dau, nang du
dao tai » dao thai, dao tao, dao thi
cao tai » cao tang
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
chuc » thuc, chu, chua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((dao tai) OR (cao tai)), nghien cuu cong coc phan hoa hoc mai hoi chuc nang dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((dao tai) OR (cao tai)), nghien cuu cong coc phan hoa hoc mai hoi chuc nang dau".
• Adding a wildcard symbol may retrieve word variants: toc sach ((dao tai) OR (cao tai)), nghien cuu cong coc phan hoa hoc mai hoi chuc nang dau*.