Perhaps you should try some spelling variations:
tu triet » su triet, tu thiet, tu trien
van dung » van dong, xay dung, tin dung
nang ma » tang ma, sang ma, nang cao
tuc van » thuc van, truc van, tuc va
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach kem
nang xa » nang x, lang xa, mang xa
sach ty » sach y, sach tu, sach thu

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 ky) OR (sach ty)) ((nang xa) or (nang ma)) hoi. hieu va cac tuc van dung tai tu triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) ((nang xa) OR (nang ma)) hoi. hieu va cac tuc van dung tai tu triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach ty)) ((nang xa) or (nang ma)) hoi. hieu va cac tuc van dung tai tu triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach ty)) ((nang xa) or (nang ma)) hoi. hieu va cac tuc van dung tai tu triet*.