Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van thanh » ban thanh, van tuan
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
ky tang » ky dang, kho tang, ky trong
cam duc » cam xuc, cao duc, pham duc
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
vai va » mai va, hai va, lai va
dai va » mai 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 va cam duc van thanh ((vai va) or (dai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((ky tang) OR (ky nang)) ma hoi. hieu va cam duc van thanh ((vai va) OR (dai va)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((ky tang) OR (ky nang)) ma hoi. hieu va cam duc van thanh ((vai va) or (dai va)) triet*".