Perhaps you should try some spelling variations:
tang van » dang van, hoang van, trong van
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
tang xa » trang xa, tang ma, lang xa
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

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