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