Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nam truoc » nam thuoc, lam truoc, nam truong
nam truc » nam thuc, nam trung, nam thuoc
va thanh » gia thanh, ban thanh, va tinh
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
y xang » ty xang
va cao » va cac, va co, va dao
va ca » va cac, va cai, va cau

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 y xang xa hoi. hieu ve ((nam truc) OR (nam truoc)) va thanh ((va ca) or (va cao)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y xang xa hoi. hieu ve ((nam truc) OR (nam truoc)) va thanh ((va ca) OR (va cao)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y xang xa hoi. hieu ve ((nam truc) OR (nam truoc)) va thanh ((va ca) or (va cao)) viet".
• Adding a wildcard symbol may retrieve word variants: thuat sach y xang xa hoi. hieu ve ((nam truc) OR (nam truoc)) va thanh ((va ca) or (va cao)) viet*.