Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ty » sach tu, sach thu, xach tay
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
cam lo » nam lo, cam ly, cam o
lo van » le van, vo van, so van
vi cua » vai cua, di 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 y) OR (sach ty)) nang ma hoa. hieu va cam lo van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach y) OR (sach ty)) nang ma hoa. hieu va cam lo van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach y) OR (sach ty)) nang ma hoa. hieu va cam lo van hanh vi cua tre*.