Perhaps you should try some spelling variations:
hanh lam » thanh lap, hanh kem, hanh va
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, pham duy
vu cham » va cham, vu kham, tu cham
lam cua » nam cua, lam chat
duc van » duc va, duc tan, duc manh
vu sach » vu bach, su sach, vu khach
hieu vu » hieu va, hieu ve, hieu su
tang ma » mang may, tang van
ty tang » tay tang, ty xang, ty hang
co sach » bo sach, cuon sach
cua tre » cua te, cuu tre, cua triet

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

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