Perhaps you should try some spelling variations:
hanh lam » thanh lap, hanh kem, hanh va
cham duc » pham duc, pham duy, phan duc
tu sach » thu sach, su sach, te sach
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
hieu vu » hieu va, hieu ve, hieu su
tang ma » tang van
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: tu sach ty ((tang ma) or (mang may)) hoi. hieu vu ((cham duc) OR (cham soc)) va hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((tang ma) OR (mang may)) hoi. hieu vu ((cham duc) OR (cham soc)) va hanh lam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((tang ma) or (mang may)) hoi. hieu vu ((cham duc) OR (cham soc)) va hanh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((tang ma) or (mang may)) hoi. hieu vu ((cham duc) OR (cham soc)) va hanh lam cua tre*.