Perhaps you should try some spelling variations:
nhanh tai » nhanh thai, nhan tai, thanh tai
van nhanh » van thanh, van hanh, van khanh
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
tai cuu » tai cuc, tai buu, tai cua
cam duc » cam xuc, cao duc, pham duc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky 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 lang xa hoi. hieu van ((cam duc) or (giao duc)) van nhanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sai) OR (su dai)) ky lang xa hoi. hieu van ((cam duc) OR (giao duc)) van nhanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((su sai) or (su dai)) ky lang xa hoi. hieu van ((cam duc) or (giao duc)) van nhanh tai cuu tre*.