Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
xuc van » luc van, xuc ban, thuc van
duc van » duc va, duc tan, duc manh
hanh di » hanh vi, hanh de, hang di
di va » dai va, di vao, doi va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((mang may) or (dang xay)) hoi. hieu van cam ((xuc van) or (duc van)) hanh di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((mang may) OR (dang xay)) hoi. hieu van cam ((xuc van) OR (duc van)) hanh di va triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang may) or (dang xay)) hoi. hieu van cam ((xuc van) or (duc van)) hanh di va triet*.