Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
trung va » truong va, trang va, trung ha
hieu van » hieu va, thien van, lieu va
van chat » cao chat
doi cua » dai cua, hoi cua
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
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: tu sach ky ((nang xa) or (nang cao)) hoi. hieu van chat ((truc va) or (trung va)) danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang cao)) hoi. hieu van chat ((truc va) OR (trung va)) danh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang cao)) hoi. hieu van chat ((truc va) or (trung va)) danh doi cua tre*.