Perhaps you should try some spelling variations:
nhanh thanh » phan thanh, nhanh tinh
thanh cau » thanh chau, thanh mau, nhanh cau
van nhanh » van thanh, van hanh, van khanh
cau tren » cu tren, dau tren, ca tren
thu sach » thuat sach, thuoc sach, thu hoach
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
hieu ve » hieu va, hieu van
tu sach » su sach, te sach, tu cach
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) OR (thu sach)) ky nang ((o hoc) or (o hai)). hieu ve cac vuc van nhanh thanh cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ((o hoc) OR (o hai)). hieu ve cac vuc van nhanh thanh cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang ((o hoc) or (o hai)). hieu ve cac vuc van nhanh thanh cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang ((o hoc) or (o hai)). hieu ve cac vuc van nhanh thanh cau tren*.