Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
danh va » doanh va, hanh va, dan va
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
anh va » hanh va

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 ((mang xa) or (nang x)) hoi. hieu va cac luc va ((danh va) or (anh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((mang xa) OR (nang x)) hoi. hieu va cac luc va ((danh va) OR (anh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((mang xa) or (nang x)) hoi. hieu va cac luc va ((danh va) or (anh va)) cua tre*.