Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
dau than » dau thau, dan than, dau thay
than cua » nhan cua, thai cua, ban cua
sach ky » sac ky, sach y, sach ty
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
va dau » va dao
cua tu » cua tuc, cua su, cua cu
x hoi » o hoi, x ho, 5 hoi

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) OR (xa hoi)). thien ((van cac) or (van hac)) nuoc va dau than cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((x hoi) OR (xa hoi)). thien ((van cac) OR (van hac)) nuoc va dau than cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((x hoi) OR (xa hoi)). thien ((van cac) or (van hac)) nuoc va dau than cua tu".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((x hoi) OR (xa hoi)). thien ((van cac) or (van hac)) nuoc va dau than cua tu*.