Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
vien cac » vien bach, vien dai, vien da
sach ky » sac ky, sach y, sach ty
va cua » va chua, via cua, ca cua
xuc va » duc va, tuc va, luc va
cua te » cua tu
ma hoi » mai hoi, ma hoa, me 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 ((ma hoi) OR (xa hoi)). hieu ((va cac) or (vien cac)) xuc va thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((ma hoi) OR (xa hoi)). hieu ((va cac) OR (vien cac)) xuc va thanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang ((ma hoi) OR (xa hoi)). hieu ((va cac) or (vien cac)) xuc va thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((ma hoi) OR (xa hoi)). hieu ((va cac) or (vien cac)) xuc va thanh va cua te*.