Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach va » sach xa, sach ha, sach dao
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
soc va » hoc va, loc va, doc va
di hoa » dai hoa, doi hoa, do hoa

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 va ((nang xa) or (nang ma)) hoi. hieu vu cham soc va hanh di hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach va ((nang xa) OR (nang ma)) hoi. hieu vu cham soc va hanh di hoa viet.
• Adding a wildcard symbol may retrieve word variants: tu sach va ((nang xa) or (nang ma)) hoi. hieu vu cham soc va hanh di hoa viet*.