Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
danh vai » danh sai, danh va, doanh van
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, dua tren

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 ty xang xa hoi. ((hieu ve) or (lieu va)) cac nuoc va danh vai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty xang xa hoi. ((hieu ve) OR (lieu va)) cac nuoc va danh vai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty xang xa hoi. ((hieu ve) or (lieu va)) cac nuoc va danh vai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty xang xa hoi. ((hieu ve) or (lieu va)) cac nuoc va danh vai ((cua tre) OR (cua triet))*.