Perhaps you should try some spelling variations:
khanh thai » nhanh thai, khanh thanh, khanh thuan
van khanh » van thanh, van hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
thai cu » thai cua, thai xu, thi cu
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cu tren » tu tren, dua tren
ve cac » va cac, vien cac
so hoc » co hoc, mo hoc, so hoa
so ha » so hoa, so va
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 (so hoc))) or (so ha)). hieu ve cac xuc van khanh thai cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((((o hoi) OR (so hoc))) OR (so ha)). hieu ve cac xuc van khanh thai cu tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((((o hoi) or (so hoc))) or (so ha)). hieu ve cac xuc van khanh thai cu tren*.