Perhaps you should try some spelling variations:
danh dau » lanh dao, hang dau, danh tu
danh sai » dung sai, danh bat, hanh san
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
ty sang » ty xang, ty hang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa

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 ty sang ma hoi. ((hieu van) or (hieu va)) cam duc va ((danh sai) OR (danh dau)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty sang ma hoi. ((hieu van) OR (hieu va)) cam duc va ((danh sai) OR (danh dau)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty sang ma hoi. ((hieu van) or (hieu va)) cam duc va ((danh sai) OR (danh dau)) cua tre*".