Perhaps you should try some spelling variations:
tac nganh » cac nganh, tao nganh, tich nganh
sach moi » sach doi, sach hoi, bach mai
cuu cong » cua cong, thu cong, cac cong
cong tac » cong ty
phan van » pham van, thanh van, luan van
su sach » so sach, vu sach
moi tap » moi tai, toi tap
ca phan » cac phan, cao phan, cap phan
hoi ca » hoi cua, hoi cac, hoi cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach moi tap, nghien cuu cong tac nganh ((khoa hoc) OR (hoa hoc)) xa hoi ca phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach moi tap, nghien cuu cong tac nganh ((khoa hoc) OR (hoa hoc)) xa hoi ca phan van".
• Adding a wildcard symbol may retrieve word variants: su sach moi tap, nghien cuu cong tac nganh ((khoa hoc) OR (hoa hoc)) xa hoi ca phan van*.