Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thai cua » than cua, tai cuc, tri cua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac lop » cac hop, cac loai
va hanh » van hanh, va thanh, va danh
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. hieu va ((cac lo) OR (cac lop)) va hanh ((dai cua) or (thai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. hieu va ((cac lo) OR (cac lop)) va hanh ((dai cua) OR (thai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang xa hoi. hieu va ((cac lo) OR (cac lop)) va hanh ((dai cua) or (thai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. hieu va ((cac lo) OR (cac lop)) va hanh ((dai cua) or (thai cua)) tre*.