Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
phan duc » phan tu, phan dau, tran duc
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
vi su » va su, ve su, ki su

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 hoa. hieu ve ((phan duc) or (pham duc)) ((va danh) or (va thanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ma hoa. hieu ve ((phan duc) OR (pham duc)) ((va danh) OR (va thanh)) vi su triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ma hoa. hieu ve ((phan duc) or (pham duc)) ((va danh) or (va thanh)) vi su triet*.