Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
va trien » va truyen, va thiet, va tuyen
hieu ve » hieu van
hieu va » lieu va, hieu qua
cam luc » cam xuc, cau luc
luc van » luoc van, luu van, duc van
ky tang » ky dang, kho tang, ky trong
ma hoi » mai hoi, xa hoi, ma hoa
vai va » mai va, dai va, hai va

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 tang) or (ky nang)) ma hoi. ((hieu ve) OR (hieu va)) cam luc van thanh vai va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((ky tang) OR (ky nang)) ma hoi. ((hieu ve) OR (hieu va)) cam luc van thanh vai va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((ky tang) or (ky nang)) ma hoi. ((hieu ve) OR (hieu va)) cam luc van thanh vai va trien".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((ky tang) or (ky nang)) ma hoi. ((hieu ve) OR (hieu va)) cam luc van thanh vai va trien*.