Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
y nang » ky nang, ly nang, v nang
va cam » va cham, va cai, va cau
va cao » va co, va dao, va bao
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di 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 y nang xa hoi. hieu ((va cam) or (((va cao) OR (va cac)))) thuc va dan vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ((va cam) OR (((va cao) OR (va cac)))) thuc va dan vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu ((va cam) or (((va cao) OR (va cac)))) thuc va dan vi cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ((va cam) or (((va cao) OR (va cac)))) thuc va dan vi cua triet*.