Perhaps you should try some spelling variations:
thanh tung » thanh cong
nhung cong » thong cong, hang cong, nhung don
lieu tinh » trieu tinh, diep tinh, bien tinh
tung tuan » trung tuan, hung tuan, quang tuan
dung cong » dung trong
khoan va » doan va, khoa ma, nhan va
khoa cap » khoa cam, khoa tap, khoa can
ho lieu » so lieu, co lieu, ho kieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho lieu tinh - thanh tung tuan ((nhung cong) OR (dung cong)) toan ((khoan va) or (khoa cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho lieu tinh - thanh tung tuan ((nhung cong) OR (dung cong)) toan ((khoan va) OR (khoa cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho lieu tinh - thanh tung tuan ((nhung cong) OR (dung cong)) toan ((khoan va) or (khoa cap))".
• Adding a wildcard symbol may retrieve word variants: ho lieu tinh - thanh tung tuan ((nhung cong) OR (dung cong)) toan ((khoan va) or (khoa cap))*.