Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
duc manh » suc manh, duc anh, duc minh
thanh vi » hanh vi, thanh va, thanh ve
duc van » duc va, duc tan, duc phan
y nang » ly nang, v nang, may nang
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((y nang) or (ky nang)) xa hoi. lieu va cam ((duc van) OR (duc manh)) thanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y nang) OR (ky nang)) xa hoi. lieu va cam ((duc van) OR (duc manh)) thanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((y nang) or (ky nang)) xa hoi. lieu va cam ((duc van) OR (duc manh)) thanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((y nang) or (ky nang)) xa hoi. lieu va cam ((duc van) OR (duc manh)) thanh vi cua te*.