Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thu sach » tu sach, thuat sach, thuoc sach
hanh hai » nhanh hai, hang hai, hanh tai
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
cam duc » cam xuc, cao duc, nam duoc
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang x hoi. hieu van ((cam duc) OR (pham duc)) van ((hanh hai) or (thanh hai)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. hieu van ((cam duc) OR (pham duc)) van ((hanh hai) OR (thanh hai)) cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. hieu van ((cam duc) OR (pham duc)) van ((hanh hai) or (thanh hai)) cau treo".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. hieu van ((cam duc) OR (pham duc)) van ((hanh hai) or (thanh hai)) cau treo*.