Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
van nhanh » van thanh, van hanh, van khanh
sach ky » sac ky, sach y, sach kem
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
sach ty » sach y, sach tu, sach thu
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hai
so ha » so hoa, so va

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) OR (sach ty)) nang ((o hoi) or (so ha)). hieu ve cac xuc van nhanh thai cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang ((o hoi) OR (so ha)). hieu ve cac xuc van nhanh thai cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach ty)) nang ((o hoi) or (so ha)). hieu ve cac xuc van nhanh thai cu tren".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach ty)) nang ((o hoi) or (so ha)). hieu ve cac xuc van nhanh thai cu tren*.