Perhaps you should try some spelling variations:
hanh sua » hinh su, hanh va, hanh tu
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
luc va » duc va, tuc va
ve cam » ve cham, ve cac, va cam
loc va » hoc va
sua va » suat va, vua va, xua va
thiet » thieu

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 (lang xa)) hoi. hieu ve cam ((loc va) or (luc va)) hanh sua va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (lang xa)) hoi. hieu ve cam ((loc va) OR (luc va)) hanh sua va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) OR (lang xa)) hoi. hieu ve cam ((loc va) or (luc va)) hanh sua va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) OR (lang xa)) hoi. hieu ve cam ((loc va) or (luc va)) hanh sua va thiet*.