Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ve triet » va trien, su triet
sach ky » sac ky, sach y, sach ty
ky hang » ky nang, ly hang, ky dang
va hanh » van hanh, va thanh, va danh
va hai » van hai, va chai, va khai
ve cac » vien cac
vi ve » va ve, gi ve, ve ve

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 hang va hai. hieu ((ve cac) or (va cac)) nuoc va hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky hang va hai. hieu ((ve cac) OR (va cac)) nuoc va hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky hang va hai. hieu ((ve cac) or (va cac)) nuoc va hanh vi ve triet*.