Perhaps you should try some spelling variations:
nang xa » lang xa, nang ma, mang xa
qua hoc » cua hoc, quang hoc, qua hoat
va danh » va dinh, va dan, va hanh
danh de » hanh de, dan de, dang de
cua tre » cua te, cuu tre, cua triet
sai ky » sac ky
de cua » le cua, te cua, dieu cua
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 y) or (sai ky)) ((nang xa) or (nang x)) hoi. hieu qua hoc nuoc va danh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sai ky)) ((nang xa) OR (nang x)) hoi. hieu qua hoc nuoc va danh de cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sai ky)) ((nang xa) or (nang x)) hoi. hieu qua hoc nuoc va danh de cua tre*.