Perhaps you should try some spelling variations:
thuat thuc » thuat thuy, thuyet thuc, thuc thuc
van thuat » va thuat, van thuan, van tuan
sach den » sach de, sach dung, mach dien
hieu van » hieu va, thien van, lieu va
su triet » su viet, su tien, ve triet
den dang » de dang, den nang, den bang
xay hoi » tay hoi, cay phoi, gay thoi
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
tu sach » thu sach, su sach, te sach
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach den dang ((xay hoi) or (xa hoi)). hieu van thuat thuc ((va danh) or (va dinh)) di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach den dang ((xay hoi) OR (xa hoi)). hieu van thuat thuc ((va danh) OR (va dinh)) di su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach den dang ((xay hoi) or (xa hoi)). hieu van thuat thuc ((va danh) or (va dinh)) di su triet*.