Perhaps you should try some spelling variations:
thieu mien » thieu nien, thieu bien, hieu hien
mien bach » vien bach, mien bac, mien dich
thu sach » tu sach, thuat sach, thuoc sach
su triet » su viet, su tien, ve triet
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
thue va » thuc va, thuyet va, thuc vat
tinh va » tich va, trinh van, trinh vat

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 ((ty nang) OR (ty hang)) xa hoi. thieu mien bach ((nhue va) or (thue va)) tinh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty nang) OR (ty hang)) xa hoi. thieu mien bach ((nhue va) OR (thue va)) tinh va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) OR (ty hang)) xa hoi. thieu mien bach ((nhue va) or (thue va)) tinh va su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) OR (ty hang)) xa hoi. thieu mien bach ((nhue va) or (thue va)) tinh va su triet*.