Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
hanh hai » thanh hai, hang hai, hanh tai
tu cach » tu cac
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
cach tu » cach thuc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
ve cam » ve cham, ve cac, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tu ((lang xa) OR (nang ma)) hoi. hieu ve cam duc van ((hanh hai) OR (nhanh hai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach tu ((lang xa) or (nang ma)) hoi. hieu ve cam duc van ((hanh hai) OR (nhanh hai)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cach tu ((lang xa) or (nang ma)) hoi. hieu ve cam duc van ((hanh hai) OR (nhanh hai)) cua tre*.