Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu quan » thien quan, hieu quan, hieu qua
thanh tung » thanh cong
cua trong » cua truong, cua trung, qua trong
tung cua » trung cua, tuong cua, dung cua
cong tan » cong tac, cong san, cong thanh
than cap » khan cap, thanh lap, thanh cac
phan cau » phan dau, phan cac, phan tu

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 quan) OR (thieu quang)) - thanh tung cua trong cong tan ((than cap) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu quan) OR (thieu quang)) - thanh tung cua trong cong tan ((than cap) OR (phan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu quan) OR (thieu quang)) - thanh tung cua trong cong tan ((than cap) or (phan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu quan) OR (thieu quang)) - thanh tung cua trong cong tan ((than cap) or (phan cau))*.