Perhaps you should try some spelling variations:
hanh lam » thanh lap, hanh kem, hanh va
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, pham duy
vu sach » vu bach, su sach, vu khach
hieu su » hieu sau, tieu su, hieu so
lam cua » nam cua, lam chat
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
hieu vu » hieu va, hieu ve, dieu vu
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: ((vu sach) or (co sach)) ty tang ma hoa. ((hieu vu) OR (hieu su)) 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)) ty tang ma hoa. ((hieu vu) OR (hieu su)) 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)) ty tang ma hoa. ((hieu vu) OR (hieu su)) cham duc van hanh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (co sach)) ty tang ma hoa. ((hieu vu) OR (hieu su)) cham duc van hanh lam cua tre*.