Perhaps you should try some spelling variations:
dung sai » dung tai, dung va, dung dat
ve triet » va trien, su triet
sach ky » sac ky, sach ty, sach kem
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
va dung » van dung, va duong, vat dung
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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 ky) OR (sach y)) dang xa hoi. hieu va cac tuc va dung sai ((ve triet) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) dang xa hoi. hieu va cac tuc va dung sai ((ve triet) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) dang xa hoi. hieu va cac tuc va dung sai ((ve triet) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) dang xa hoi. hieu va cac tuc va dung sai ((ve triet) or (cua te))*.