Perhaps you should try some spelling variations:
dai tren » dat tren, dau tren, dan tren
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
nam xua » nam cua, nam mua, nam qua
sach ky » sac ky, sach y, sach ty
te sach » toc sach
hieu va » hieu qua
xua va » xuat va, vua va, sua va
co hoi » co hoc
di dai » si dai, li dai, vi dai

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 hoi) or (co loi)). ((hieu va) or (lieu va)) nam xua va danh di dai tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((co hoi) OR (co loi)). ((hieu va) OR (lieu va)) nam xua va danh di dai tren.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((co hoi) or (co loi)). ((hieu va) or (lieu va)) nam xua va danh di dai tren*.