Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thua thiet » thuat thiet, thua thien, chua thiet
hieu van » hieu va, thien van, lieu va
nang xa » nang ma, mang xa, ang xa
lang xa » lang ha, dang xay, lang van
sach ky » sac ky, sach y, sach ty
van hac » van hoc, van ha, van hai
hac luc » nhan luc, than luc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va thua » va thuat, va thuc, va thu
luc va » duc va, tuc va, loc 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 ky ((((nang xa) OR (nang x))) or (lang xa)) hoi. hieu van hac luc va hanh va thua thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((((nang xa) OR (nang x))) OR (lang xa)) hoi. hieu van hac luc va hanh va thua thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((((nang xa) OR (nang x))) or (lang xa)) hoi. hieu van hac luc va hanh va thua thiet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((((nang xa) OR (nang x))) or (lang xa)) hoi. hieu van hac luc va hanh va thua thiet*.