Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
tuan tai » toan tai, quan tai, tan tai
van tuan » van quan, van ban, anh tuan
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
tai cua » thai cua, tai cuc, tri cua
luc van » luoc van, luu van, duc van
ve cam » ve cham, ve cac, va cam
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, ma hoa

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