Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
tang tai » hang tai, dung tai, sang tao
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
thue va » thuyet va, thuc vat, thuat va
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

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