Perhaps you should try some spelling variations:
ve triet » va trien, su triet
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac
ve cau » ke cau, va cau, le cau
vi ve » va ve, gi ve, ve 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 thieu ((nang xa) or (sang ma)) hoi. hieu ((ve cau) OR (ve cac)) duc va thanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thieu ((nang xa) OR (sang ma)) hoi. hieu ((ve cau) OR (ve cac)) duc va thanh vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thieu ((nang xa) or (sang ma)) hoi. hieu ((ve cau) OR (ve cac)) duc va thanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: su sach thieu ((nang xa) or (sang ma)) hoi. hieu ((ve cau) OR (ve cac)) duc va thanh vi ve triet*.