Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
duc xanh » duc anh, duc manh, duc hanh
nhung xa » nhung ba, nhung ca, nhung ga
chung xa » chung ta, chung nam, chung cua
sach thi » sach thu, sach tai, sach thieu
su sach » so sach, vu sach
hai cua » thai cua, hoi cua, lai cua
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
ve cam » ve cham, ve cac, va cam

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 thi ((nhung xa) OR (chung xa)) hoi. hieu ve cam duc xanh hanh ((hai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi ((nhung xa) OR (chung xa)) hoi. hieu ve cam duc xanh hanh ((hai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thi ((nhung xa) OR (chung xa)) hoi. hieu ve cam duc xanh hanh ((hai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach thi ((nhung xa) OR (chung xa)) hoi. hieu ve cam duc xanh hanh ((hai cua) or (dai cua)) tre*.