Perhaps you should try some spelling variations:
cong thong » cong thuong, cong trong, dong thong
hanh sinh » hanh tinh, hanh dinh, hinh sinh
thong van » trong van, thong va, thong quan
chieu ca » chieu cao, chieu day, nhieu cau
van tang » van thang, van trang, van nang
hieu ca » hieu cac, hieu cua, hieu va
sinh va » sinh vat, tinh va, dinh van
va cong » tai cong, cua cong
tang ca » tang cua, hang ca, tang ma

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)) - hanh sinh va cong thong van tang ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu ca) OR (chieu ca)) - hanh sinh va cong thong van tang ca.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu ca) or (chieu ca)) - hanh sinh va cong thong van tang ca*.