Perhaps you should try some spelling variations:
luan phan » luan van, luan hoan
hieu luan » hieu luat, hieu quan, tieu luan
hoc sach » hoc sinh, hoc cac, hoc anh
phan dai » phan dau, phan day, phan loai
ban hang » ngan hang
ve triet » va trien, su triet
sach ty » sach y, sach tu, sach thu
ty lang » tay lang, ty xang, ty hang
lang xa » lang ha, dang xay, lang van
va ve » va de, va le, va vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ty lang xa hoi. hieu luan phan dai ((ban hanh) or (ban hang)) va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ty lang xa hoi. hieu luan phan dai ((ban hanh) OR (ban hang)) va ve triet.
• Adding a wildcard symbol may retrieve word variants: hoc sach ty lang xa hoi. hieu luan phan dai ((ban hanh) or (ban hang)) va ve triet*.