Perhaps you should try some spelling variations:
dang mam » dang nam, dang mau, dang mat
te sach » toc sach
hanh va » hang va, hanh vi
thuc va » thuc vat, thuc dan, thuc day
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
dang ma » dang mau, dang mat, tang ma
tuc va » truc va, tuc xa, duc va
va cua » va chua, via cua, ca cua
ve cam » ve cham, ve cac, va cam

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