Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
sach hoi » sach doi, sach moi, cach thoi
cuu cong » cua cong, thu cong, cac cong
cong luc » dong luc, cong suc, cong duc
luc ngan » luc nganh, luc nhan, luat ngan
ngan hoa » nganh hoa, nhan hoa, nganh khoa
phan van » pham van, luan van, tran van
vu sach » vu bach, su sach, vu khach
hoi tap » hoi dap, hoc tap, hoi tai
hoa van » hoa dan, hoang van, hoa phan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach hoi tap, nghien cuu cong luc ngan hoa hoc ma hoa van ((phan van) OR (thanh van))~.
• Adding a wildcard symbol may retrieve word variants: vu sach hoi tap, nghien cuu cong luc ngan hoa hoc ma hoa van ((phan van) or (thanh van))*.