Perhaps you should try some spelling variations:
toc xach » toc sach, tuoc xanh, hoc sach
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
va trien » va truyen, va thiet, va tuyen
tai lang » tai cong, thi lan, tai san
tay lang » tay tang, tay quang, tham lang
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
hanh va » hang va, hanh vi
su viet » so viet
van cam » van nam, van lam, van cau

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: toc xach ((tay lang) OR (tai lang)) xa hoi. hieu van cam luc van hanh va ((su viet) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc xach ((tay lang) OR (tai lang)) xa hoi. hieu van cam luc van hanh va ((su viet) or (va trien))~".
• Adding a wildcard symbol may retrieve word variants: toc xach ((tay lang) OR (tai lang)) xa hoi. hieu van cam luc van hanh va ((su viet) or (va trien))*.