Perhaps you should try some spelling variations:
danh chung » doanh chung, dinh chung, lanh chung
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mang xa » lang xa, mang may, dang xay
thi van » thi lan, thi hanh, thi nang
van dat » van dao, van dau, dan dat
va danh » va dinh, va dan, va hanh
cu tren » tu tren, dua tren
cu tre » cua tre, cuu tre, cu tri
nuoc » quoc, duoc, ngoc

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 ((mang xa) or (nang x)) hoi. thi van dat nuoc va danh chung ((cu tre) OR (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((mang xa) OR (nang x)) hoi. thi van dat nuoc va danh chung ((cu tre) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((mang xa) or (nang x)) hoi. thi van dat nuoc va danh chung ((cu tre) OR (cu tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang xa) or (nang x)) hoi. thi van dat nuoc va danh chung ((cu tre) OR (cu tren))*.