Perhaps you should try some spelling variations:
ve triet » va trien, su triet
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
cac tuc » cac toc, cac tac, cac nuoc
va nang » van nang, da nang, cam nang
nang di » nang du, hang di, nang ji
y lang » o lang, _ lang, tay lang
cac tu » cac thu, cach tu, cac du
di ve » dai ve, de ve, do ve

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y lang xa hoi. hieu qua ((cac tuc) OR (cac tu)) va nang di ve triet~".
• Adding a wildcard symbol may retrieve word variants: su sach y lang xa hoi. hieu qua ((cac tuc) OR (cac tu)) va nang di ve triet*.