Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
van hanh » van thanh, ban hanh, van anh
tang van » dang van, hoang van, trong van
hanh su » hanh sua, hinh su, hanh tu
bo sach » co sach, hoc sach
van hoc » van hoa
ty tang » tay tang, ty xang, ty hang
so sanh » do sanh
qua cam » qua cham, qua cac, qua ca
cam lo » nam lo, cam ly, cam o
lo van » le van, vo van, so van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((bo sach) or (so sanh)) ty tang van hoc. hieu qua cam lo van hanh su ((va triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((bo sach) OR (so sanh)) ty tang van hoc. hieu qua cam lo van hanh su ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bo sach) or (so sanh)) ty tang van hoc. hieu qua cam lo van hanh su ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: ((bo sach) or (so sanh)) ty tang van hoc. hieu qua cam lo van hanh su ((va triet) OR (ve triet))*.