Perhaps you should try some spelling variations:
thanh hoa » thanh pho
thanh hai » thanh phan, thanh san
nang dai » nang dau, nang tai, nang cai
lang dai » lang hai, lang mai, lang chai
te sach » toc sach
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
sach ly » sach y, sach lo, sach ty
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ly ((nang dai) OR (lang dai)) hoi. hieu va cam duc va ((thanh hai) or (thanh hoa)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly ((nang dai) OR (lang dai)) hoi. hieu va cam duc va ((thanh hai) OR (thanh hoa)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly ((nang dai) OR (lang dai)) hoi. hieu va cam duc va ((thanh hai) or (thanh hoa)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ly ((nang dai) OR (lang dai)) hoi. hieu va cam duc va ((thanh hai) or (thanh hoa)) cua tre*.