Perhaps you should try some spelling variations:
thanh dan » thanh san, thanh van, thanh dat
thi chang » thi hang, chi chang, thi chung
hieu van » hieu va, thien van, lieu va
ty chang » ty hang, ty chung, ty xang
dan cua » dan ca, ban cua, dai cua
duc gia » quoc gia
nam duc » nam duoc, pham duc, nam thuc
te sach » toc sach
cua te » cua tu
xu ho » x ho, xu co, su ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu hoach)) ((ty chang) OR (thi chang)) xu ho. hieu van nam duc gia thanh dan cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu hoach)) ((ty chang) OR (thi chang)) xu ho. hieu van nam duc gia thanh dan cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu hoach)) ((ty chang) OR (thi chang)) xu ho. hieu van nam duc gia thanh dan cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu hoach)) ((ty chang) OR (thi chang)) xu ho. hieu van nam duc gia thanh dan cua te*.