Perhaps you should try some spelling variations:
cong thong » cong thuong, cong trong, dong thong
phan sinh » phan slinh, nhan sinh, phau sinh
thong van » trong van, thong va, thong quan
van trang » vang trang, van thang, va trang
chieu ca » chieu cao, chieu day, nhieu cau
sinh phi » kinh phi, linh phi, sinh pho
phi cong » thi cong, phan cong, pham cong
trang ca » trang va, trong ca, tang ca
hieu ca » hieu cac, hieu cua, hieu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu ca) or (chieu ca)) - phan sinh phi cong thong van trang ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu ca) OR (chieu ca)) - phan sinh phi cong thong van trang ca.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu ca) or (chieu ca)) - phan sinh phi cong thong van trang ca*.