Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
su sach » so sach, vu sach
luc bat » suc bat, luc nhat, luat bat
luc ban » duc ban, cuc ban, luc van
va cham » va chat, va tham
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
ty sang » ty xang, ty hang, duy sang
vai cua » dai cua, hai cua, lai cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty sang ((ma hoa) or (xa hoi)). hieu va cham ((luc ban) OR (luc bat)) thanh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty sang ((ma hoa) OR (xa hoi)). hieu va cham ((luc ban) OR (luc bat)) thanh vai cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty sang ((ma hoa) or (xa hoi)). hieu va cham ((luc ban) OR (luc bat)) thanh vai cua vat".
• Adding a wildcard symbol may retrieve word variants: su sach ty sang ((ma hoa) or (xa hoi)). hieu va cham ((luc ban) OR (luc bat)) thanh vai cua vat*.