Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
van nhanh » van thanh, van hanh, van khanh
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
thai cau » thai cao, toan cau, thai van
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
co hai » co dai, co hoi, o hai
o hoi » co hoi, o hoc, 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: tu sach ky nang ((o hoi) or (co hai)). ((hieu ve) OR (hieu van)) cac xuc van nhanh thai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (co hai)). ((hieu ve) OR (hieu van)) cac xuc van nhanh thai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hoi) or (co hai)). ((hieu ve) OR (hieu van)) cac xuc van nhanh thai cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (co hai)). ((hieu ve) OR (hieu van)) cac xuc van nhanh thai cau tren*.