Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
thai cua » than cua, tai cuc, tri cua
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly va

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