Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
tai phuong » thi phuong, cac phuong, va phuong
trinh vat » trinh van, trinh luat, sinh vat
vat thong » va thong, vat trong, mat thong
ho chieu » theo chieu, hoc thieu, mot chieu
tai phan » tai thanh, tai phong, tai ngan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu tinh - hanh trinh vat thong cong ((tai phan) or (tai phuong)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu tinh - hanh trinh vat thong cong ((tai phan) OR (tai phuong)) tu*.