Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
nang mai » nang ma, nang tai, lang mai
va thanh » gia thanh, ban thanh, va tinh
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang mai hoi. ((hieu ve) OR (hieu va)) cac luc va thanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang mai hoi. ((hieu ve) OR (hieu va)) cac luc va thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang mai hoi. ((hieu ve) OR (hieu va)) cac luc va thanh dai cua tre*.