Perhaps you should try some spelling variations:
thang loi » thanh loi, thang long, thanh moi
dang xay » dang van, van xay
hang loi » hang doi, tang loi, thanh loi
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
nam luc » nang luc, nhan luc, nam thuc
luc van » luoc van, luu van, duc van
nang xa » nang x, lang xa, nang ma
luu tre » luu tru, cuu tre, luy tre

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (dang xay)) hoi. hieu van nam luc van ((hang loi) OR (thang loi)) luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (dang xay)) hoi. hieu van nam luc van ((hang loi) OR (thang loi)) luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (dang xay)) hoi. hieu van nam luc van ((hang loi) OR (thang loi)) luu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (dang xay)) hoi. hieu van nam luc van ((hang loi) OR (thang loi)) luu tre*.