Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
vat thanh » dat thanh, gat thanh, tat thanh
cac thuc » cach thuc, cac thu, can thuc
thanh di » thanh doi, thanh de, thanh do
su triet » su viet, su tien, ve triet
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
sac ky » cac ky, sai ky

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

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