Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hai khoi » mai khoi, thai khoa, chai khoa
tai khoi » tai khoa, mai khoi, tao khoi
hieu van » hieu va, thien van, lieu va
han tai » hang tai, nhan tai, van tai
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
van cam » van nam, van lam, van cau
xuc va » duc va, tuc va, luc va
va han » va phan, van han, va hanh

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 ky lang ((hai khoi) or (tai khoi)). hieu van cam xuc va han tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang ((hai khoi) OR (tai khoi)). hieu van cam xuc va han tai ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang ((hai khoi) or (tai khoi)). hieu van cam xuc va han tai ((cuu tre) or (cau tren))*.