Perhaps you should try some spelling variations:
trung thang » trung thanh, trung tang, truong thanh
hanh thinh » hanh chinh, hanh trinh, hanh tinh
thinh dac » thinh duc, trinh dac, thinh doan
dac trung » duc trung, cac truong, tai trung
chieu ca » chieu cao, chieu day, nhieu cau
thang va » hang va, trang va, thong va
hieu ca » hieu cac, hieu cua, hieu va
va hang » van hang, va nang, va lang
hang ca » hang va, nang cao, hang tai

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 thinh dac trung thang va hang ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu ca) OR (chieu ca)) - hanh thinh dac trung thang va hang ca.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu ca) or (chieu ca)) - hanh thinh dac trung thang va hang ca*.