Perhaps you should try some spelling variations:
phan phoi » phan thi
hoc sach » hoc sinh, hoc cac, hoc anh
sach dao » lanh dao
cua ngan » cua ban, vu ngan, cua dan
phoi hoc » hoi hoc, phoi thuoc, hoa hoc
coc phan » co phan, hoc phan, cac phan
cac cong » cua cong
cuu cong » cua cong, thu cong
ngan dan » ngan danh, nhan dan, ngan han
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
hoi cua » hoi chuc
dao tai » dao thai, dao tao, cao tai

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

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