Perhaps you should try some spelling variations:
tap doan » tap quan
thai dua » thai cua, thi dua, thai doan
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
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 cac xuc van hanh ((thai dua) or (tap doan)) 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 cac xuc van hanh ((thai dua) OR (tap doan)) tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (co hai)). hieu ve cac xuc van hanh ((thai dua) or (tap doan)) tren*.