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
hieu van » hieu va, thien van, lieu va
cam loc » cam lo
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
hieu ve » hieu va
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
loc va » hoc va, luc va
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 ty ((nang xa) or (sang ma)) hoi. ((hieu ve) OR (hieu van)) cam loc va thanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (sang ma)) hoi. ((hieu ve) OR (hieu van)) cam loc va thanh vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (sang ma)) hoi. ((hieu ve) OR (hieu van)) cam loc va thanh vi ve triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (sang ma)) hoi. ((hieu ve) OR (hieu van)) cam loc va thanh vi ve triet*.