Perhaps you should try some spelling variations:
thanh tuan » thanh toan, thanh xuan, thanh thanh
khan than » phan than, khoan thanh, khanh thanh
cau treo » cau theo, cau tren, cau triet
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
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 y nang ((o hoi) or (o hai)). hieu ve cam xuc van ((khan than) or (thanh tuan)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((o hoi) OR (o hai)). hieu ve cam xuc van ((khan than) OR (thanh tuan)) cau treo.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((o hoi) or (o hai)). hieu ve cam xuc van ((khan than) or (thanh tuan)) cau treo*.