Perhaps you should try some spelling variations:
nang duoc » ngang duoc, nang doc, nganh duoc
duoc hoi » quoc hoi, duoc hoc, duoc si
hieu van » thien van, lieu va, hieu ve
va triet » va thiet, va trien, ve triet
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
lam tuc » lam thuoc, lam truoc, luat tuc
xa hanh » xa thanh, xa khanh, va hanh
sac ky » cac ky, sai ky
vi va » vi van, vai va, vu va

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