Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
nang doc » nang luc
nang doi » nang noi, hang doi, nang dong
dang van » hoang van, hang va
cac tuc » cac toc, cac tu, cac tac
tu sach » thu sach, su sach, tu cach
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
te sach » toc 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 (te sach)) ky dang van hoi. hieu va cac tuc xa ((nang doi) or (nang doc)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky dang van hoi. hieu va cac tuc xa ((nang doi) OR (nang doc)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky dang van hoi. hieu va cac tuc xa ((nang doi) or (nang doc)) va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky dang van hoi. hieu va cac tuc xa ((nang doi) or (nang doc)) va triet*.