Perhaps you should try some spelling variations:
thien van » thi van
trinh dai » trinh tai, trinh di, trinh dan
trinh da » trinh dan, trinh dao, trinh do
hieu van » hieu va, lieu va, hieu ve
te sach » toc sach
cac duc » cac du, cao duc, cac dac
sach tu » sach thu, cach tu, sach ty
hang co » hang cho, hang ca, nang co
tu hang » thu hang, tu hanh, tu hung
cua tre » cua te, cuu tre, cua triet
co hai » co dai, co hoi, o hai

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 hang co hai. ((hieu van) or (thien van)) cac duc va ((trinh dai) OR (trinh da)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu hang co hai. ((hieu van) OR (thien van)) cac duc va ((trinh dai) OR (trinh da)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu hang co hai. ((hieu van) or (thien van)) cac duc va ((trinh dai) OR (trinh da)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach tu hang co hai. ((hieu van) or (thien van)) cac duc va ((trinh dai) OR (trinh da)) cua tre*.