Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
sach ky » sach y, sach ty, sach kem
cao hoi » cau hoi, co hoi, cao hoc
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
vai cuu » vai cua
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky

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) OR (sac ky)) nang cao hoi. ((lieu va) or (hieu qua)) cam duc va danh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach ky) OR (sac ky)) nang cao hoi. ((lieu va) OR (hieu qua)) cam duc va danh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) OR (sac ky)) nang cao hoi. ((lieu va) or (hieu qua)) cam duc va danh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) OR (sac ky)) nang cao hoi. ((lieu va) or (hieu qua)) cam duc va danh vai cuu tre*.