Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
thieu sang » chieu sang, thieu khang, thieu quang
hanh trinh » canh tranh, hanh chinh
quang dung » quang trung, ung dung, cuong dung
trong hach » trong cach, trong hanh, trong thanh
trong mach » trong cac, trong minh, trong anh
hoc thieu » toc thieu, hoc hien
toan tai » toan tap, doanh tai, toan cao
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 - hanh trinh quang dung ((trong hach) or (trong mach)) ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh trinh quang dung ((trong hach) OR (trong mach)) ((toan tai) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh trinh quang dung ((trong hach) or (trong mach)) ((toan tai) or (toan ban))*.