Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
khang cu » khung cua, thang cua, chung cu
khan cua » nhan cua, than cua, han cua
tac than » tac thanh, tam than, bac thanh
tac nhan » tao nhan, cac nhan, dac nhan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu tinh - hanh ((khang cu) or (khan cua)) dung cong ((tac than) OR (tac nhan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - hanh ((khang cu) OR (khan cua)) dung cong ((tac than) OR (tac nhan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - hanh ((khang cu) or (khan cua)) dung cong ((tac than) OR (tac nhan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - hanh ((khang cu) or (khan cua)) dung cong ((tac than) OR (tac nhan)) cao*.