Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac lop » cac hop, cac loai
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
cac lo » cac co, cac bo, cac ho

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 ky nang xa hoi. lieu va ((cac lo) OR (cac lop)) va hanh ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. lieu va ((cac lo) OR (cac lop)) va hanh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang xa hoi. lieu va ((cac lo) OR (cac lop)) va hanh ((vai cua) or (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. lieu va ((cac lo) OR (cac lop)) va hanh ((vai cua) or (hai cua)) tre*.