Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » thong cong, hang cong, nhung don
hoc chieu » hoc thieu, ho chieu, hoc hien
dung cong » dung trong
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 chieu tinh - hanh trinh quan ((nhung cong) or (dung cong)) dan ((toan ban) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - hanh trinh quan ((nhung cong) OR (dung cong)) dan ((toan ban) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - hanh trinh quan ((nhung cong) or (dung cong)) dan ((toan ban) or (toan tap))*.