Perhaps you should try some spelling variations:
chau tre » chay tren, chau tho, cho tre
kem chau » kem chu, liem chau, kieu chau
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
cau luc » cau truc, cau phuc
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
ty hang » ly hang, thi hang, thu hang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty hang) or (ty xang)) x ho. ((hieu ve) OR (hieu va)) cau luc van hanh kem chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty hang) OR (ty xang)) x ho. ((hieu ve) OR (hieu va)) cau luc van hanh kem chau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty hang) or (ty xang)) x ho. ((hieu ve) OR (hieu va)) cau luc van hanh kem chau tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty hang) or (ty xang)) x ho. ((hieu ve) OR (hieu va)) cau luc van hanh kem chau tre*.