Perhaps you should try some spelling variations:
chua thiet » chuan thiet, cua thiet, thua thiet
lang van » dang van, tang van, hoang van
hieu van » hieu va, thien van, lieu va
thu sach » tu sach, thuat sach, thuoc sach
lang xa » lang ha, dang xay
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
van hac » van hoc, van ha, van hai
hac loc » hau loc, thac toc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va chua » vua chua, ca chua, va chu
loc va » hoc va, luc va

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