Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
van nhanh » van thanh, van hanh, van khanh
cau tren » cu tren, dau tren, ca tren
thai cau » thai cao, toan cau, thai van
nuoc van » nuoc va, nuoc san, luoc van
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ve cac » va cac, vien cac
mo hoc » mon hoc, co hoc
o hoi » co hoi, o hoc, o hoa
o hai » co hai, so hai, o lai

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