Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
manh hon » manh ho, minh hon, manh huong
cua tre » cua te, cuu tre, cua triet
hon tai » khon tai, von tai, han tai
cam suc » cam xuc, cao suc, cham soc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang

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 tang xa hoi. ((hieu ve) OR (hieu van)) cam suc manh hon tai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang xa hoi. ((hieu ve) OR (hieu van)) cam suc manh hon tai ((cua tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky tang xa hoi. ((hieu ve) OR (hieu van)) cam suc manh hon tai ((cua tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang xa hoi. ((hieu ve) OR (hieu van)) cam suc manh hon tai ((cua tre) or (su triet))*.