Perhaps you should try some spelling variations:
thieu sang » thieu khang, thieu quang, hieu lang
chieu sang » chieu sach, chieu xanh, hieu lang
nhung cong » dung cong, thong cong, hang cong
hinh sinh » tinh sinh, hinh kinh, hinh minh
hinh dinh » binh dinh, trinh dinh, hinh anh
vat nhung » va nhung, vap nhung, vai nhung
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan tap » toan ban

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 sang) or (chieu sang)) - ((hinh sinh) OR (hinh dinh)) vat nhung cong tan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sang)) - ((hinh sinh) OR (hinh dinh)) vat nhung cong tan toan tap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu sang)) - ((hinh sinh) OR (hinh dinh)) vat nhung cong tan toan tap*".