Perhaps you should try some spelling variations:
nhanh thanh » phan thanh, nhanh tinh
van nhanh » van thanh, van hanh, van khanh
thanh cu » thanh chu, thanh tu, thanh ca
hieu ve » hieu va, hieu van
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cu tren » tu tren, dua tren
ve cac » va cac, vien cac
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 ty nang ((o hoi) or (o hai)). hieu ve cac luc van nhanh thanh cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((o hoi) OR (o hai)). hieu ve cac luc van nhanh thanh cu tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((o hoi) or (o hai)). hieu ve cac luc van nhanh thanh cu tren*.