Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
chat cua » nhat cua, chat va, chat huu
thanh de » hanh de, thanh ve, thanh do
te sach » toc sach
hieu va » lieu va, hieu qua
hieu vu » hieu ve, hieu su, dieu vu
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang xa hoi. ((hieu vu) or (hieu va)) chat cua vat thanh de ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. ((hieu vu) OR (hieu va)) chat cua vat thanh de ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang xa hoi. ((hieu vu) or (hieu va)) chat cua vat thanh de ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. ((hieu vu) or (hieu va)) chat cua vat thanh de ((cua triet) OR (su triet))*.