Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thuat nhung » thuat hung, thuat chung, thuat chuong
thieu sang » chieu sang, thieu khang, hieu lang
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hanh tram » hanh tam, hanh trang, thanh tran
cong tinh » cong trinh, cong vinh, long tinh
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: hoc ((thieu sang) OR (thieu quang)) - ((hanh tram) or (hanh trinh)) thuat nhung cong tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (thieu quang)) - ((hanh tram) OR (hanh trinh)) thuat nhung cong tinh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu quang)) - ((hanh tram) or (hanh trinh)) thuat nhung cong tinh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu quang)) - ((hanh tram) or (hanh trinh)) thuat nhung cong tinh toan ban*.