Perhaps you should try some spelling variations:
luan luan » quan luan, luan luong, luan hoan
sach hoi » sach doi, sach moi, cach thoi
khoa hoc » hoa hoc
hai luan » thai luan, khai luan, hai quan
te sach » toc sach
hoi tap » hoi dap, hoc tap, hoi tai
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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 hoi tap, nghien cuu ((dong luc) OR (nang luc)) toan khoa hoc xa hai luan luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach hoi tap, nghien cuu ((dong luc) OR (nang luc)) toan khoa hoc xa hai luan luan van".
• Adding a wildcard symbol may retrieve word variants: te sach hoi tap, nghien cuu ((dong luc) OR (nang luc)) toan khoa hoc xa hai luan luan van*.