Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, lang van
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
cau luc » cau truc, cau phuc
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky ((lang xa) or (dang xay)) hoi. hieu van cau luc va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((lang xa) OR (dang xay)) hoi. hieu van cau luc va danh di cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((lang xa) or (dang xay)) hoi. hieu van cau luc va danh di cua tre*.