Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh ve » hanh ve, thanh va, thanh vien
luoc van » luoc can, luoc va, luot van
hieu cua » hieu qua, dieu cua, bieu cua
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
luc van » luu van, duc van, luc va
nang xa » nang x, lang xa, mang xa
te sach » toc sach
ve cua » le cua, de cua, te cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((nang xa) or (nang ma)) hoi. hieu cua cac ((luc van) OR (luoc van)) thanh ve cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (nang ma)) hoi. hieu cua cac ((luc van) OR (luoc van)) thanh ve cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang xa) or (nang ma)) hoi. hieu cua cac ((luc van) OR (luoc van)) thanh ve cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) or (nang ma)) hoi. hieu cua cac ((luc van) OR (luoc van)) thanh ve cua triet*.