Perhaps you should try some spelling variations:
phan chong » phan cong, phan hong, phap chong
nghien cac » nghiep cach, nghien cuu, nghiep cay
lich can » lich han, tich can, lich chau
dich can » dich han, dich ran, tich can
sach hoc » cach hoc, sach hoi, mach hoc
gian dan » gian lang
hoc phan » hoc dan, hoc pho
cong hoc » dong hoc, cong hoa, cong coc
cac cong » cua cong
ca gian » ca giang, ca giao, va gian
su sach » so sach, vu sach
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 hoc tap, nghien cac cong hoc phan chong ((dich can) OR (lich can)) hoi ca gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoc tap, nghien cac cong hoc phan chong ((dich can) OR (lich can)) hoi ca gian dan".
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cac cong hoc phan chong ((dich can) OR (lich can)) hoi ca gian dan*.