Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi du » va du, ve du, li du

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 y nang ma hoi. lieu va cam ((xuc va) or (luc va)) hanh ((vi dum) OR (vi du)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang ma hoi. lieu va cam ((xuc va) OR (luc va)) hanh ((vi dum) OR (vi du)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang ma hoi. lieu va cam ((xuc va) or (luc va)) hanh ((vi dum) OR (vi du)) tren".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ma hoi. lieu va cam ((xuc va) or (luc va)) hanh ((vi dum) OR (vi du)) tren*.