Perhaps you should try some spelling variations:
trong hach » trong mach, trong cach, trong hanh
hanh trinh » canh tranh, hanh chinh
hien sang » hien trang, khien bang, chieu sang
luat dung » luat chung, luat quang, thuat dung
suat dung » thuat dung, xuat duong, suat huong
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 hien sang - hanh trinh ((luat dung) OR (suat dung)) trong hach ((toan tai) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sang - hanh trinh ((luat dung) OR (suat dung)) trong hach ((toan tai) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien sang - hanh trinh ((luat dung) OR (suat dung)) trong hach ((toan tai) or (toan ban))".
• Adding a wildcard symbol may retrieve word variants: hoc hien sang - hanh trinh ((luat dung) OR (suat dung)) trong hach ((toan tai) or (toan ban))*.