Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
luu hanh » huu han
luu van » cuu van, luan van
vu cham » va cham, vu kham, tu cham
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
nang xa » lang xa, nang ma, mang xa
hieu vu » hieu va, hieu ve, hieu su
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ly ((nang xa) or (nang x)) hoi. hieu vu cham ((luu van) OR (luu hanh)) hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly ((nang xa) OR (nang x)) hoi. hieu vu cham ((luu van) OR (luu hanh)) hanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly ((nang xa) or (nang x)) hoi. hieu vu cham ((luu van) OR (luu hanh)) hanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ly ((nang xa) or (nang x)) hoi. hieu vu cham ((luu van) OR (luu hanh)) hanh vi su triet*.