Perhaps you should try some spelling variations:
chay tren » thai tren, cau tren, chay dien
canh hanh » xanh hanh, canh tranh, danh thanh
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
cau luc » cau truc, cau phuc
ca tren » cau tren, cu tren, la tren
hieu va » lieu va, hieu qua
ty nang » ky nang, ty hang, ly nang
va cau » van cau, va cac, va dau
x hoi » xa hoi, o hoi, x ho

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 nang) or (ty xang)) x hoi. hieu va cau luc canh hanh va ((chay tren) OR (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) x hoi. hieu va cau luc canh hanh va ((chay tren) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ty xang)) x hoi. hieu va cau luc canh hanh va ((chay tren) OR (ca tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) x hoi. hieu va cau luc canh hanh va ((chay tren) OR (ca tren))*.