Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham cuu » cap cuu, chat cua
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach kem
hanh ly » khanh ly, hanh ky, hang ly
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
sang ma » tang ma, nang ma, sang tao
sach ty » sach y, sach tu, sach thu
ly cua » le cua

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

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