Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
hang cau » hang dau, hang ca, nhung cau
hieu van » hieu va, thien van, lieu va
dinh tai » dinh toai, dinh tri, dinh thi
chau tre » chau tho, cho tre, cau tra
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
xuc va » tuc va, luc va, xac va

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 ty hang cau hoi. hieu van nam ((xuc va) or (duc va)) dinh tai ((chau tre) OR (chay tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty hang cau hoi. hieu van nam ((xuc va) OR (duc va)) dinh tai ((chau tre) OR (chay tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty hang cau hoi. hieu van nam ((xuc va) or (duc va)) dinh tai ((chau tre) OR (chay tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ty hang cau hoi. hieu van nam ((xuc va) or (duc va)) dinh tai ((chau tre) OR (chay tren))*.