Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
van nhanh » van thanh, van hanh, van khanh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
thai cu » thai cua, thai xu, thi cu
cac xuc » cac nuoc, chat xuc, cac cuoc
cu tren » tu tren, dua tren
hieu ve » hieu va, hieu van
so hai » son hai, su hai, so ha
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) OR (cam xuc)) van nhanh thai cu 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) OR (cam xuc)) van nhanh thai cu 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) OR (cam xuc)) van nhanh thai cu tren".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((o hoi) or (so hai)). hieu ve ((cac xuc) OR (cam xuc)) van nhanh thai cu tren*.