Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, pham duy
su sach » so sach
lam cua » nam cua, lam chat
va danh » va dinh, va dan, va hanh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tang ma » mang may, tang van
ty tang » tay tang, ty xang, ty hang
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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) or (vu sach)) ty tang ma hoi. hieu vu cham duc ((va danh) or (van hanh)) lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty tang ma hoi. hieu vu cham duc ((va danh) OR (van hanh)) lam cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ty tang ma hoi. hieu vu cham duc ((va danh) or (van hanh)) lam cua tre*.