Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
hai chu » hai chau, hoi chu, hai chi
hai cau » hai chau, hai hau, hoi cau
tu sach » thu sach, su sach, te sach
cao hoi » cau hoi, co hoi, cao hoc
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
ve cam » ve cham, va cam, ve cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang cao hoi. hieu ((ve cam) OR (ve cac)) luc va hanh ((hai cau) or (hai chu)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang cao hoi. hieu ((ve cam) OR (ve cac)) luc va hanh ((hai cau) OR (hai chu)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang cao hoi. hieu ((ve cam) OR (ve cac)) luc va hanh ((hai cau) or (hai chu)) treo".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang cao hoi. hieu ((ve cam) OR (ve cac)) luc va hanh ((hai cau) or (hai chu)) treo*.