Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
va doanh » van doanh, vay doanh, va danh
doanh va » doan va, doanh tai, doanh cua
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca 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) OR (nang ma)) hoi. ((lieu va) or (hieu qua)) pham duc va doanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang xa) OR (nang ma)) hoi. ((lieu va) OR (hieu qua)) pham duc va doanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky ((nang xa) OR (nang ma)) hoi. ((lieu va) or (hieu qua)) pham duc va doanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang xa) OR (nang ma)) hoi. ((lieu va) or (hieu qua)) pham duc va doanh va cua tre*.