Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
trang xa » trang va, trang ha, trong xa
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
tang ha » lang ha, tang ma, trung ha
tang xa » tang ma, lang xa, mang xa
hai ky » thai ky, hoi ky, hai ly
ve cam » ve cham, ve cac, va cam
su hai » su tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su hai ky ((((tang xa) or (tang ha))) or (trang xa)) hoi. hieu ve cam duc van hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su hai ky ((((tang xa) OR (tang ha))) OR (trang xa)) hoi. hieu ve cam duc van hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: su hai ky ((((tang xa) or (tang ha))) or (trang xa)) hoi. hieu ve cam duc van hanh thai cua tre*.