Perhaps you should try some spelling variations:
thieu lang » hieu lang, thieu khang, thieu quang
nhung cong » dung cong, thong cong, nhung don
hoc thieu » toc thieu, hoc hien
trung vap » trung va, trung van, trung lap
trung cap » truong cao, trung tam
hang cong » dang cong, hang nong, bang cong
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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 lang - hanh ((trung vap) OR (trung cap)) ((nhung cong) or (hang cong)) tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu lang - hanh ((trung vap) OR (trung cap)) ((nhung cong) OR (hang cong)) tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu lang - hanh ((trung vap) OR (trung cap)) ((nhung cong) or (hang cong)) tac toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu lang - hanh ((trung vap) OR (trung cap)) ((nhung cong) or (hang cong)) tac toan cao*.