Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
vai cua » hai cua, lai cua, bai cua
tuc van » thuc van, truc van, tuc va
dao tuc » dao duc
hieu va » lieu va, hieu qua
sach tu » sach thu, sach ty, sach uu
nang xa » nang x, lang xa, nang ma
cach tu » cach thuc
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach tu) or (cach tu)) nang xa hoi. hieu va dao tuc van hanh ((vai cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach tu) OR (cach tu)) nang xa hoi. hieu va dao tuc van hanh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach tu) or (cach tu)) nang xa hoi. hieu va dao tuc van hanh ((vai cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach tu) or (cach tu)) nang xa hoi. hieu va dao tuc van hanh ((vai cua) OR (dai cua)) tre*.