Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
ky lang » ky tang, tay lang
ky dang » ky danh
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
dau vat » dau va, bau vat, dan vat
vat cua » mat cua, bat cua, dat cua
tuc va » thuc va, truc va, tuc xa
va dau » va dao

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