Perhaps you should try some spelling variations:
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
tuc van » thuc van, truc van, duc van
tai cua » thai cua, tai cuc, dai cua
va cao » va cac, va co, va dao
tuc va » thuc va, truc va, tuc xa

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