Perhaps you should try some spelling variations:
cach thuc » anh thuc
dia thanh » gia thanh, da thanh, dinh thanh
su triet » su viet, su tien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
cua tre » cua te, cuu tre, cua triet
bo sach » co sach, hoc sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cac thu » cac thoi
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: bo sach y nang xa hoi. hieu va ((cach thuc) OR (cac thu)) dia thanh vi ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach y nang xa hoi. hieu va ((cach thuc) OR (cac thu)) dia thanh vi ((cua tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach y nang xa hoi. hieu va ((cach thuc) OR (cac thu)) dia thanh vi ((cua tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: bo sach y nang xa hoi. hieu va ((cach thuc) OR (cac thu)) dia thanh vi ((cua tre) or (su triet))*.