Perhaps you should try some spelling variations:
te sach » toc sach
va hanh » van hanh, va thanh, va danh
cau tre » cau tren, cau treo, cau tra
cao hoi » cau hoi, co hoi, cao hoc
y nang » ky nang, ly nang, v nang
ve cao » va cao, ve bao, ve co
di cau » da cau, diem cau
ve cac » va cac, vien cac

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 y nang cao hoi. hieu ((ve cao) OR (ve cac)) suc ((va hanh) or (gia thanh)) di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang cao hoi. hieu ((ve cao) OR (ve cac)) suc ((va hanh) OR (gia thanh)) di cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang cao hoi. hieu ((ve cao) OR (ve cac)) suc ((va hanh) or (gia thanh)) di cau tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang cao hoi. hieu ((ve cao) OR (ve cac)) suc ((va hanh) or (gia thanh)) di cau tre*.