Perhaps you should try some spelling variations:
tinh thai » sinh thai, tinh toan, tinh chat
hanh thai » nhanh thai, hinh thai, hanh tai
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
tang xa » trang xa, lang xa, tang ha
hai ky » thai ky, hoi ky, hai ly
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 ma)) hoi. hieu ve pham duc van ((hanh thai) or (tinh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su hai ky ((tang xa) OR (tang ma)) hoi. hieu ve pham duc van ((hanh thai) OR (tinh thai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su hai ky ((tang xa) or (tang ma)) hoi. hieu ve pham duc van ((hanh thai) or (tinh thai)) cua tre*.