Perhaps you should try some spelling variations:
hanh thanh » nhanh thanh, thanh thanh, khanh thanh
thanh cau » thanh chau, thanh mau, nhanh cau
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
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 y nang ((o hoi) or (o hai)). hieu ve cac xuc van hanh thanh cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((o hoi) OR (o hai)). hieu ve cac xuc van hanh thanh cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((o hoi) or (o hai)). hieu ve cac xuc van hanh thanh cau tren*.