Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
phan duc » pham duc, phan tu, phan dau
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
vai cua » hai cua, lai cua, bai cua

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