Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van thanh » ban thanh, van tuan
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
ky tang » ky nang, ky dang, kho tang
ma hoi » xa hoi, ma hoa, me hoi
vai va » mai va, hai va, lai va
dai va » mai va
va cam » va cham, va cac, va cao

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 ((ma hoi) OR (mai 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 ((ma hoi) OR (mai 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 ((ma hoi) OR (mai hoi)). hieu va cam duc van thanh ((vai va) or (dai va)) triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky tang ((ma hoi) OR (mai hoi)). hieu va cam duc van thanh ((vai va) or (dai va)) triet*.