Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh vai » thanh hai, thanh van, thanh tai
luoc van » luoc can, luoc va, luot van
va triet » va thiet, va trien, ve triet
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
luc van » luu van, duc van, luc va
ky dang » ky nang, ky danh
ma hoi » mai hoi, xa hoi, me hoi
vai va » mai va, dai va, hai va
ve cam » ve cham, ve cac, va cam

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 dang ((ma hoi) or (ma hoa)). hieu ve cam ((luc van) OR (luoc van)) thanh vai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky dang ((ma hoi) OR (ma hoa)). hieu ve cam ((luc van) OR (luoc van)) thanh vai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky dang ((ma hoi) or (ma hoa)). hieu ve cam ((luc van) OR (luoc van)) thanh vai va triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky dang ((ma hoi) or (ma hoa)). hieu ve cam ((luc van) OR (luoc van)) thanh vai va triet*.