Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoa doanh » toan doanh, hoa dan
sach dao » lanh dao
cuu cong » thu cong, cac cong
khoa hoc » hoa hoc
phan dau » phan tu, hang dau
te sach » toc sach
dao tap » dao tao, dao tay, dao gap
va phan » van phan, va phat, va phap
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach dao tap, nghien ((cuu cong) OR (cua cong)) hoa doanh khoa hoc ma hoi va phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach dao tap, nghien ((cuu cong) OR (cua cong)) hoa doanh khoa hoc ma hoi va phan dau".
• Adding a wildcard symbol may retrieve word variants: te sach dao tap, nghien ((cuu cong) OR (cua cong)) hoa doanh khoa hoc ma hoi va phan dau*.