Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh tai, hanh van
dang mau » dong mau, dang van, dang su
hanh va » hang va, hanh vi
sach ky » sac ky, sach y, sach ty
te sach » toc sach
dang ma » dang mam, dang mat, tang ma
cua tre » cua te, cuu tre, cua triet
thu xa » thu xac, thu ha, thu xe

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 ((dang ma) OR (dang mau)) hoa. hieu van nam thu xa ((hanh vai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((dang ma) OR (dang mau)) hoa. hieu van nam thu xa ((hanh vai) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((dang ma) OR (dang mau)) hoa. hieu van nam thu xa ((hanh vai) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((dang ma) OR (dang mau)) hoa. hieu van nam thu xa ((hanh vai) or (hanh va)) cua tre*.