Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu lang » hieu lang, thieu quang, chieu sang
hanh trung » thanh trung, hanh trang, manh trung
nhung cong » dung cong, thong cong, hang cong
trung vap » trung cap, trung va, trung van
vap nhung » va nhung, ve nhung, voi nhung
tam toan » tap toan, tam than, pham toan
ban than » ban thanh, van thanh, ban hang

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