Perhaps you should try some spelling variations:
nien dau » nhien dai, chien dau, hien dai
lang van » dang van, tang van, hoang van
nien dat » nen dat, mien dat, tien dat
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
su sach » so sach, vu sach
van hoi » van hoa, van hoc, van hoe
cuu tre » cua tre, cau tren, cau treo
y lang » o lang, _ lang, tay lang

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 lang van hoi. thieu ((nien dat) OR (nien dau)) nuoc va ((hanh di) or (hanh de)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y lang van hoi. thieu ((nien dat) OR (nien dau)) nuoc va ((hanh di) OR (hanh de)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y lang van hoi. thieu ((nien dat) OR (nien dau)) nuoc va ((hanh di) or (hanh de)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach y lang van hoi. thieu ((nien dat) OR (nien dau)) nuoc va ((hanh di) or (hanh de)) cuu tre*.