Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
xuan nang » xuan hoang, van nang, xuan nhan
luan nang » luan van, van nang, luan san
cong tac » cong ty
tac chon » tac chong, tap chon, tac cho
chon cau » chon cac, chon chu, thong cau
va tinh » may tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu tinh) or (va tinh)) - tnhh hoang ((xuan nang) OR (luan nang)) cong tac chon cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (va tinh)) - tnhh hoang ((xuan nang) OR (luan nang)) cong tac chon cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu tinh) or (va tinh)) - tnhh hoang ((xuan nang) OR (luan nang)) cong tac chon cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (va tinh)) - tnhh hoang ((xuan nang) OR (luan nang)) cong tac chon cau*.