Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
cuu tre » cua tre, cau tren, cau treo
tai cuu » tai cuc, tai buu, tai cua
cam duc » cam xuc, cao duc, pham duc
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
su dai » sau dai, si dai, su tai
su sai » su tai, su hai, su mai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sai) or (su dai)) ky tang xa hoi. hieu van ((cam duc) or (giao duc)) van hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su dai)) ky tang xa hoi. hieu van ((cam duc) OR (giao duc)) van hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((su sai) or (su dai)) ky tang xa hoi. hieu van ((cam duc) or (giao duc)) van hanh tai cuu tre*.