Perhaps you should try some spelling variations:
sang tao » hang tai
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh dao » lanh dao, thanh dat, thanh dam
ve triet » va trien, su triet
te sach » toc sach
sang ma » tang ma, nang ma, mang may
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
dao ve » bao ve, dap ve, dau ve

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach _ ((sang ma) OR (sang tao)) hoi. hieu van cam luc van hanh dao ve triet~.
• Adding a wildcard symbol may retrieve word variants: te sach _ ((sang ma) or (sang tao)) hoi. hieu van cam luc van hanh dao ve triet*.