Perhaps you should try some spelling variations:
thanh tai » thanh toan, doanh tai, thanh san
thanh van » thanh san, thanh toan, thanh phan
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
qua ban » cua ban, qua quan
cay qua » cau qua, cac qua, cay lua
van cay » van cau, van bay, van ca
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
tu sac » tu sach, tu cac, tu san

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 sang ma hoi. hieu van cay qua ban ((((thanh hai) or (thanh van))) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ma hoi. hieu van cay qua ban ((((thanh hai) OR (thanh van))) OR (thanh tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ma hoi. hieu van cay qua ban ((((thanh hai) or (thanh van))) or (thanh tai)) cua tre*.