Perhaps you should try some spelling variations:
dau tien » van tien
danh dau » lanh dao, hang dau, danh tu
sach ky » sac ky, sach y, sach ty
dau dau » dan dau, dat dau, dau da
va danh » va dinh, va dan, va hanh
nam xua » nam cua, nam mua, nam qua
te sach » toc sach
hieu va » lieu va
nang ra » nang ma, lang ra, nang va
nang ro » nang co, nang ho, nang rong
xua va » xuat va, vua va, sua va

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 ((nang ro) or (nang ra)) hoi. ((hieu va) OR (hieu qua)) nam xua va danh dau dau tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang ro) OR (nang ra)) hoi. ((hieu va) OR (hieu qua)) nam xua va danh dau dau tien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang ro) or (nang ra)) hoi. ((hieu va) OR (hieu qua)) nam xua va danh dau dau tien*".