Perhaps you should try some spelling variations:
ly trong » le trong
van hanh » van thanh, ban hanh, van anh
chua tre » chua tri, cua tre, chua trieu
su sach » so sach, vu sach
van dam » van dao, van dau, van lam
duc van » duc va, duc tan, duc manh
hanh va » hang va, hanh vi
va chua » vua chua, ca chua, va chu

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 ((ly trong) OR (cay trong)) xa hoi. hieu ((van dam) or (van nam)) duc van hanh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly trong) OR (cay trong)) xa hoi. hieu ((van dam) OR (van nam)) duc van hanh va chua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly trong) OR (cay trong)) xa hoi. hieu ((van dam) or (van nam)) duc van hanh va chua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly trong) OR (cay trong)) xa hoi. hieu ((van dam) or (van nam)) duc van hanh va chua tre*.