Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
va nang » van nang, da nang, cam nang
nang di » nang du, hang di, nang ji
tu sach » su sach, te sach, tu cach
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

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