Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
su sach » so sach, vu sach
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
va cham » va chat, va tham
hieu va » lieu va, hieu qua
lang ha » long ha
cuu tre » cua tre, cau tren, cau treo

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 ((nang x) or (lang ha)) hoi. hieu va cham duc va ((danh vi) OR (danh di)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang x) OR (lang ha)) hoi. hieu va cham duc va ((danh vi) OR (danh di)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang x) or (lang ha)) hoi. hieu va cham duc va ((danh vi) OR (danh di)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang x) or (lang ha)) hoi. hieu va cham duc va ((danh vi) OR (danh di)) cuu tre*.