Perhaps you should try some spelling variations:
vanh tri » van tri, vanh tai, thanh tri
te sach » toc sach
va vanh » va van, va danh, va hanh
dao xuc » dao duc, dao tuc, dao xu
hieu va » lieu va, hieu qua
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
su sach » so sach, vu sach
va dao » ca dao
xuc va » duc va, tuc va, luc va
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) or (su sach)) ((ky lang) OR (ky tang)) xa hoi. hieu va dao xuc va vanh tri cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ((ky lang) OR (ky tang)) xa hoi. hieu va dao xuc va vanh tri cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (su sach)) ((ky lang) OR (ky tang)) xa hoi. hieu va dao xuc va vanh tri cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ((ky lang) OR (ky tang)) xa hoi. hieu va dao xuc va vanh tri cua te*.