Perhaps you should try some spelling variations:
hanh khoa » hang khoa, anh khoa, hanh hoa
sach doi » sach hoi, sach moi, sach bai
sach dao » lanh dao
hoc hanh » hoc nhanh, hoc thanh, hoc anh
khoa hoc » hoa hoc
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
ma khoa » may khoa, mai khoa, da khoa
van van » van ban, tan van, san van
luan » quan, lan

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 doi) OR (sach dao)) tac, nghien cuu mon hoc hanh khoa hoc ma khoa luan van van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach doi) OR (sach dao)) tac, nghien cuu mon hoc hanh khoa hoc ma khoa luan van van".
• Adding a wildcard symbol may retrieve word variants: te ((sach doi) OR (sach dao)) tac, nghien cuu mon hoc hanh khoa hoc ma khoa luan van van*.