Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
danh doi » danh di, thanh doi, dung doi
su triet » su viet, su tien, ve triet
ty lang » tay lang, ty hang, tu lang
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
doi su » oi su, don su, voi su

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 lang) or (ty xang)) xa hoi. hieu va cac nuoc va danh doi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((ty lang) OR (ty xang)) xa hoi. hieu va cac nuoc va danh doi su triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ((ty lang) or (ty xang)) xa hoi. hieu va cac nuoc va danh doi su triet*.