Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
cau luc » cau truc, cau phuc
hieu ve » hieu va, hieu van
cac luc » coc luc, cac nuoc, cac cuoc
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
va cua » va chua, via cua, ca 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 y ((nang xa) or (nang x)) hoi. hieu ve ((cac luc) OR (cau luc)) va danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang xa) OR (nang x)) hoi. hieu ve ((cac luc) OR (cau luc)) va danh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y ((nang xa) or (nang x)) hoi. hieu ve ((cac luc) OR (cau luc)) va danh va cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((nang xa) or (nang x)) hoi. hieu ve ((cac luc) OR (cau luc)) va danh va cua tre*.