Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
kham soc » cham soc, kham cuoc, ham so
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
lam cua » nam cua, lam chat
va danh » va dinh, va dan, va hanh
vu kham » vu khanh
hieu vu » hieu va, hieu ve, hieu su
mai hoi » mai khoi, dai hoi, lai hoi
ty hang » ly hang, ty xang, thi hang
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty hang ((ma hoi) or (mai hoi)). hieu vu kham soc ((van hanh) or (va danh)) lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hang ((ma hoi) OR (mai hoi)). hieu vu kham soc ((van hanh) OR (va danh)) lam cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty hang ((ma hoi) or (mai hoi)). hieu vu kham soc ((van hanh) or (va danh)) lam cua tre*.