Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van thanh » ban thanh, van tuan
hieu ve » hieu va, hieu van
luc van » luoc van, luu van, duc van
ky tang » ky dang, kho tang, ky trong
cam luc » cam xuc, cau luc
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
vai va » mai va, dai va, lai va
hai va » hai van, thai va, hoi 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 cam luc van thanh ((vai va) OR (hai 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 cam luc van thanh ((vai va) OR (hai 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 cam luc van thanh ((vai va) OR (hai va)) trien".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((ky tang) or (ky nang)) ma hoi. hieu ve cam luc van thanh ((vai va) OR (hai va)) trien*.