Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dau tren » dau tien, dat tren, dau tieng
mang xa » lang xa, mang may, dang xay
hieu va » hieu qua
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
y mang » cay mang
vi dau » vi dai, va dau, bi dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y mang xa hoi. ((hieu va) OR (lieu va)) cau ((xuc van) or (duc van)) hanh vi dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y mang xa hoi. ((hieu va) OR (lieu va)) cau ((xuc van) OR (duc van)) hanh vi dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y mang xa hoi. ((hieu va) OR (lieu va)) cau ((xuc van) or (duc van)) hanh vi dau tren".
• Adding a wildcard symbol may retrieve word variants: thu sach y mang xa hoi. ((hieu va) OR (lieu va)) cau ((xuc van) or (duc van)) hanh vi dau tren*.