Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
nang dai » nang dau, nang tai, lang dai
xuc van » duc van, luc van, vuc van
tu sach » su sach, te sach, tu cach
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
ve cam » ve cham, ve cac, va cam
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ma cua
ca cua » co cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) y nang dai hoi. hieu ve cam xuc van hanh ((va cua) OR (ca cua)) quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang dai hoi. hieu ve cam xuc van hanh ((va cua) OR (ca cua)) quoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) y nang dai hoi. hieu ve cam xuc van hanh ((va cua) OR (ca cua)) quoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang dai hoi. hieu ve cam xuc van hanh ((va cua) OR (ca cua)) quoc*.