Perhaps you should try some spelling variations:
doanh hai » doanh tai, doanh ha, doanh nhan
doan hai » doanh tai, hoang hai, doan va
te sach » toc sach
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky danh
cua tre » cua te, cuu tre, cua triet
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: te sach ((ky dang) or (ky nang)) xay hoi. hieu ve cam duc ban ((doanh hai) OR (doan hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky dang) OR (ky nang)) xay hoi. hieu ve cam duc ban ((doanh hai) OR (doan hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky dang) or (ky nang)) xay hoi. hieu ve cam duc ban ((doanh hai) OR (doan hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky dang) or (ky nang)) xay hoi. hieu ve cam duc ban ((doanh hai) OR (doan hai)) cua tre*.