Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
hanh tri » thanh tri, hanh tai, hanh trinh
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
soc va » loc va, doc va, goc 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: thu sach ky ((lang xa) or (van xay)) hoi. hieu van cham ((soc va) OR (hoc va)) hanh tri va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((lang xa) OR (van xay)) hoi. hieu van cham ((soc va) OR (hoc va)) hanh tri va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((lang xa) or (van xay)) hoi. hieu van cham ((soc va) OR (hoc va)) hanh tri va thiet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((lang xa) or (van xay)) hoi. hieu van cham ((soc va) OR (hoc va)) hanh tri va thiet*.