Perhaps you should try some spelling variations:
chuan dao » chuan doan, chuan iso, chuan ha
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
danh dai » danh dau, danh di, danh sai
chuc dao » chuc danh, chuc giao, cho dao
van chat » cao chat
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet

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 ky ((lang xa) or (nang x)) hoi. hieu van chat ((chuc dao) OR (chuan dao)) danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((lang xa) OR (nang x)) hoi. hieu van chat ((chuc dao) OR (chuan dao)) danh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((lang xa) or (nang x)) hoi. hieu van chat ((chuc dao) OR (chuan dao)) danh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((lang xa) or (nang x)) hoi. hieu van chat ((chuc dao) OR (chuan dao)) danh dai cua tre*.