Perhaps you should try some spelling variations:
tuan hanh » tuan anh, quan hanh, toan hanh
thu sach » tu sach, thuat sach, thuoc sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
sach ky » sac ky, sach y, sach ty
do tuan » do xuan, do quang
ky lang » ky nang, ky dang, ky tang
hieu va » lieu va, hieu qua
cac do » cac don, cac doi, cac du
va cua » va chua, via cua, ma cua
ca cua » co cua

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 ky lang xa hoi. ((hieu ve) or (hieu va)) cac do tuan hanh ((va cua) OR (ca cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. ((hieu ve) OR (hieu va)) cac do tuan hanh ((va cua) OR (ca cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky lang xa hoi. ((hieu ve) or (hieu va)) cac do tuan hanh ((va cua) OR (ca cua)) triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. ((hieu ve) or (hieu va)) cac do tuan hanh ((va cua) OR (ca cua)) triet*.