Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hac tuc » thac toc, thai tuc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va hac » van hac, va khac, va cac
tuc va » thuc va, truc va, tuc xa
va va » va van, va vua, va vai

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 (((dang xay) or (van xay)))) hoi. hieu va hac tuc va hanh va va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (((dang xay) OR (van xay)))) hoi. hieu va hac tuc va hanh va va triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (((dang xay) or (van xay)))) hoi. hieu va hac tuc va hanh va va triet*.