Perhaps you should try some spelling variations:
ve triet » va trien, su triet
nang doc » nang luc
nang doi » nang noi, hang doi, nang dong
cac tuc » cac toc, cac tu, cac tac
tu sach » thu sach, te sach, tu cach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
hieu va » lieu va, hieu qua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) ky lang xa hoi. hieu va cac tuc xa ((nang doi) or (nang doc)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky lang xa hoi. hieu va cac tuc xa ((nang doi) OR (nang doc)) ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky lang xa hoi. hieu va cac tuc xa ((nang doi) or (nang doc)) ve triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky lang xa hoi. hieu va cac tuc xa ((nang doi) or (nang doc)) ve triet*.