Perhaps you should try some spelling variations:
nhanh thanh » phan thanh, nhanh tinh
van nhanh » van thanh, van hanh, van khanh
thanh mau » hanh mau, thanh san, thanh hai
mau tren » dau tren, cau tren, mau tieng
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
o hoc » co hoc, mo hoc, so hoc
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 y nang ((o hoc) or (o hai)). hieu ve cac vuc van nhanh thanh mau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((o hoc) OR (o hai)). hieu ve cac vuc van nhanh thanh mau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((o hoc) or (o hai)). hieu ve cac vuc van nhanh thanh mau tren*.