Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cua tre » cua te, cuu tre, dua tren
dan vai » dan va, dan tai, dan vat
cao tuc » dao tuc, cao duc, cao suc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sach va » sach xa, sach ha, sach dao
sach v » sach y, sach 2, sach vay
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
va cao » va cac, va co, va dao

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