Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
nang noi » nang doc
nang doi » nang doc, hang doi, nang dong
sach ky » sac ky, sach y, sach ty
cac toc » cac toi, cac nuoc, cac thoi
tu sach » thu sach, su sach, te sach
cac tac » cac bac, cac dac, cac tai
hieu va » lieu va, hieu qua
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ha hoi » hoa hoi, ha noi, xa hoi

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 ky lang ha hoi. hieu va ((cac tac) OR (cac toc)) xa ((nang doi) or (nang noi)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang ha hoi. hieu va ((cac tac) OR (cac toc)) xa ((nang doi) OR (nang noi)) va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang ha hoi. hieu va ((cac tac) OR (cac toc)) xa ((nang doi) or (nang noi)) va triet*".