Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, mang xa, ang xa
nang ma » tang ma, sang ma, nang cao
nam luc » nang luc, nhan luc, nam thuc
va dung » van dung, va duong, vat dung
dung co » dung cho, dung cong, dung cua
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
co cua » con cua, ca cua, cong cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((((nang xa) or (nang ma))) or (nang x)) hoi. hieu van nam luc va dung co cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((((nang xa) OR (nang ma))) OR (nang x)) hoi. hieu van nam luc va dung co cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((((nang xa) or (nang ma))) or (nang x)) hoi. hieu van nam luc va dung co cua tre*.