Perhaps you should try some spelling variations:
toc xach » toc sach, tuoc xanh, hoc sach
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
xach tay » canh tay
va trien » va truyen, va thiet, va tuyen
tay lang » tai lang, tay tang, tay quang
cam luc » cam xuc
lang xa » lang ha, dang xay, lang van
cau luc » cau truc, cau phuc
hanh va » hang va, hanh vi
su viet » so viet

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 xa hoi. hieu van ((cam luc) OR (cau 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 xa hoi. hieu van ((cam luc) OR (cau luc)) van hanh va ((su viet) or (va trien))~".
• Adding a wildcard symbol may retrieve word variants: toc xach tay lang xa hoi. hieu van ((cam luc) OR (cau luc)) van hanh va ((su viet) or (va trien))*.