Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
sach ky » sac ky, sach y, sach ty
dinh vi » dinh ve, dinh viet, dinh tri
danh vi » hanh vi, danh di, danh va
nam xua » nam cua, nam mua, nam qua
te sach » toc sach
nang co » nang cao, nang doc, nang noi
hieu va » hieu qua
xua va » xuat va, vua va, sua va
co loi » co hoi

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 co loi. ((hieu va) or (lieu va)) nam xua va ((danh vi) OR (dinh vi)) dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang co loi. ((hieu va) OR (lieu va)) nam xua va ((danh vi) OR (dinh vi)) dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang co loi. ((hieu va) or (lieu va)) nam xua va ((danh vi) OR (dinh vi)) dau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang co loi. ((hieu va) or (lieu va)) nam xua va ((danh vi) OR (dinh vi)) dau tren*.