Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
luoc van » luoc can, luoc va, luc van
van dang » van dong, van dung, van nang
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, dan cac
van bac » van ban, van bao, van hac
tai su » tai so, tai tu, tai du
x hoi » xa hoi, o hoi, x ho

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 x hoi. thien ((van cac) or (van bac)) luoc van dang ((tai su) OR (lai su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang x hoi. thien ((van cac) OR (van bac)) luoc van dang ((tai su) OR (lai su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang x hoi. thien ((van cac) or (van bac)) luoc van dang ((tai su) OR (lai su)) triet".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang x hoi. thien ((van cac) or (van bac)) luoc van dang ((tai su) OR (lai su)) triet*.