Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
hanh thai » nhanh thai, hinh thai, hanh tai
manh hanh » xanh hanh, danh thanh, minh thanh
duc manh » suc manh, duc anh, duc minh
cua tre » cua te, cuu tre, dua tren
sach ky » sac ky, sach ty, sach kem
nang ro » nang co, nang ho, nang ra
vien da » vien dai, hien dai
da duc » dao duc, da duoc, do duc
ro hai » co hai, o hai, so hai

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) or (sach y)) nang ro hai. hieu vien da duc manh hanh thai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang ro hai. hieu vien da duc manh hanh thai ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach y)) nang ro hai. hieu vien da duc manh hanh thai ((cua tre) OR (cua triet))*".