Perhaps you should try some spelling variations:
khanh hoa » thanh hoa, hang hoa
sach doi » sach hoi, sach moi, sach dao
phan van » pham van, thanh van, luan van
su sach » so sach, vu sach
doi tap » doi tac, doi dap, doi tai
mot hoc » mon hoc, mo hoc, bot hoc
va phan » van phan, va phat, va phap
hoc xa » hoc ma

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 doi tap, nghien cuu ((mot hoc) OR (mot goc)) khanh hoa hoc xa hoi va phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach doi tap, nghien cuu ((mot hoc) OR (mot goc)) khanh hoa hoc xa hoi va phan van".
• Adding a wildcard symbol may retrieve word variants: su sach doi tap, nghien cuu ((mot hoc) OR (mot goc)) khanh hoa hoc xa hoi va phan van*.