Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh oai
thanh dat » thanh san, thanh hai, thanh van
cua tre » cua te, cuu tre, cua triet
ke mang » ke trang
ke nang » ky nang, ki nang, kha nang
may thi » may thoi, day thi, mai thi
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
su sac » su sach, su cac, su xac
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ((ke mang) OR (ke nang)) may thi. hieu ve cam duc ban ((thanh dai) or (thanh dat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ((ke mang) OR (ke nang)) may thi. hieu ve cam duc ban ((thanh dai) OR (thanh dat)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ((ke mang) OR (ke nang)) may thi. hieu ve cam duc ban ((thanh dai) or (thanh dat)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ((ke mang) OR (ke nang)) may thi. hieu ve cam duc ban ((thanh dai) or (thanh dat)) cua tre*.