Perhaps you should try some spelling variations:
phan duc » pham duc, phan tu, tran duc
phan dau » phan tu, hang dau
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
va danh » va dinh, va dan, va hanh
lai cua » dai cua, lai chau, thai cua
hai cua » thai cua, dai cua, hoi cua

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 cao hoi. lieu va ((phan duc) OR (phan dau)) va danh ((lai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang cao hoi. lieu va ((phan duc) OR (phan dau)) va danh ((lai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang cao hoi. lieu va ((phan duc) OR (phan dau)) va danh ((lai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang cao hoi. lieu va ((phan duc) OR (phan dau)) va danh ((lai cua) or (hai cua)) tre*.