Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van ban
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va
cac dat » cac dan, cai dat, cac dai
van anh » van thanh, tuan anh, van minh
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di 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 ma hoi. ((hieu va) OR (hieu qua)) cac dat ((van hanh) or (van anh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cac dat ((van hanh) OR (van anh)) vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cac dat ((van hanh) or (van anh)) vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ma hoi. ((hieu va) OR (hieu qua)) cac dat ((van hanh) or (van anh)) vi cua vat*.