Perhaps you should try some spelling variations:
danh doi » danh di, thanh doi, dung doi
tang van » hoang van, trong van, tang luan
dang van » hoang van, hang va
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
xa danh » va danh, dia danh, nam danh
cac toc » cac toi, cac nuoc, cac thoi
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
toc xa » tuc xa, toc ta, hoc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang ma) or (((tang van) OR (dang van)))) hoi. hieu ve cac toc xa danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang ma) OR (((tang van) OR (dang van)))) hoi. hieu ve cac toc xa danh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang ma) or (((tang van) OR (dang van)))) hoi. hieu ve cac toc xa danh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang ma) or (((tang van) OR (dang van)))) hoi. hieu ve cac toc xa danh doi cua tre*.