Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trung » thanh trung, hanh trang, manh trung
cong thanh » dong thanh, cong trinh, truong thanh
hieu lang » chieu sang, nhieu tang, hieu van
trung vap » trung cap, trung va, trung van
vap nhung » va nhung, ve nhung, voi nhung
cong tan » cong tac, cong san, cong ty
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((hieu lang) OR (hieu quang)) - hanh trung vap nhung ((cong tan) or (cong thanh)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((hieu lang) OR (hieu quang)) - hanh trung vap nhung ((cong tan) OR (cong thanh)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((hieu lang) OR (hieu quang)) - hanh trung vap nhung ((cong tan) or (cong thanh)) toan ban".
• Adding a wildcard symbol may retrieve word variants: toc ((hieu lang) OR (hieu quang)) - hanh trung vap nhung ((cong tan) or (cong thanh)) toan ban*.