Perhaps you should try some spelling variations:
sach ky » sac ky, sach y, sach kem
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
sach ty » sach y, sach tu, sach thu
x hoi » xa hoi, o hoi, x ho
di va » dai va, di vao, doi va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) OR (sach ty)) nang x hoi. hieu ((ve cham) or (va cham)) thuc va hanh di va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang x hoi. hieu ((ve cham) OR (va cham)) thuc va hanh di va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach ty)) nang x hoi. hieu ((ve cham) or (va cham)) thuc va hanh di va thiet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach ty)) nang x hoi. hieu ((ve cham) or (va cham)) thuc va hanh di va thiet*.