Perhaps you should try some spelling variations:
hanh lam » thanh lap, hanh kem, hanh va
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
vu kham » vu khanh
lam cua » nam cua, lam chat
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
vu cham » va cham, tu cham, qua cham
tang ma » mang may, tang van
ty tang » tay tang, ty xang, ty hang
co sach » bo sach, cuon sach, hoc sach

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 (co sach)) ty tang ma hoa. hieu ((vu cham) OR (vu kham)) duc van hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) ty tang ma hoa. hieu ((vu cham) OR (vu kham)) duc van hanh lam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) ty tang ma hoa. hieu ((vu cham) OR (vu kham)) duc van hanh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) ty tang ma hoa. hieu ((vu cham) OR (vu kham)) duc van hanh lam cua tre*.