Perhaps you should try some spelling variations:
chet duoc » cho duoc, che quoc, chi duoc
van tuan » van quan, van ban, anh tuan
che duoc » che thuoc, che do, te duoc
chat duc » chat xuc, chat doc, pham duc
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
le cuu » le cua, le huu, le cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky dang xa hoi. hieu ve ((chat duc) or (((chet duoc) OR (che duoc)))) van tuan le cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang xa hoi. hieu ve ((chat duc) OR (((chet duoc) OR (che duoc)))) van tuan le cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky dang xa hoi. hieu ve ((chat duc) or (((chet duoc) OR (che duoc)))) van tuan le cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky dang xa hoi. hieu ve ((chat duc) or (((chet duoc) OR (che duoc)))) van tuan le cuu tre*.