Perhaps you should try some spelling variations:
ky trong » ly trong, ke trong, cay trong
kho tang » cao tang
tu sach » thu sach, su sach, te sach
va tinh » may tinh
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, luc va
dam su » dan su, dat su, dam tu
va cam » va cham, va cac, va cao
da su » dan su, dat su, va 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 ((ky trong) or (kho tang)) xa hoi. hieu va cam xuc va tinh ((dam su) or (da su)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky trong) OR (kho tang)) xa hoi. hieu va cam xuc va tinh ((dam su) OR (da su)) viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky trong) or (kho tang)) xa hoi. hieu va cam xuc va tinh ((dam su) or (da su)) viet*.