Perhaps you should try some spelling variations:
dat tren » dat trong, dua tren
dang xay » dang van, van xay
cham cuu » cap cuu, chat cua
lang xa » lang ha, lang van
va cham » va chat, va tham
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
cu tren » tu tren, dua tren
su sach » so sach, vu sach
cuu va » cuu van, cuu ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((lang xa) or (dang xay)) hoi. lieu va cham cuu va hanh va ((cu tren) or (dat tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((lang xa) OR (dang xay)) hoi. lieu va cham cuu va hanh va ((cu tren) OR (dat tren)).
• Adding a wildcard symbol may retrieve word variants: su sach y ((lang xa) or (dang xay)) hoi. lieu va cham cuu va hanh va ((cu tren) or (dat tren))*.