Perhaps you should try some spelling variations:
thien van » thi van
dang mau » dong mau, dang van, dang su
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, lieu va, hieu ve
te sach » toc sach
tai cua » thai cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach ty
mau hoi » cau hoi, mai hoi, mau ho
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 mau hoi. ((hieu van) or (thien van)) cam ((xuc va) or (tuc va)) hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang mau hoi. ((hieu van) OR (thien van)) cam ((xuc va) OR (tuc va)) hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky dang mau hoi. ((hieu van) or (thien van)) cam ((xuc va) or (tuc va)) hanh tai cua tre*.