Perhaps you should try some spelling variations:
thieu thanh » thien thanh, thi thanh, thu thanh
hanh trinh » canh tranh, hanh chinh
lang suong » bang suong, lang muong, lang tuong
hoc thieu » toc thieu, hoc hien
trinh han » trinh quan
lang song » nang song, bang song, lang son
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 thanh - hanh trinh han ((lang suong) or (lang song)) tinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu thanh - hanh trinh han ((lang suong) OR (lang song)) tinh toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu thanh - hanh trinh han ((lang suong) or (lang song)) tinh toan ban*.