Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
phan duc » pham duc, phan tu, phan dau
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
va phan » van phan, va phat, va phap
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay
hieu va » lieu va, hieu qua

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 ty ((mang xa) or (nang ma)) hoi. hieu va phan duc va ((danh vi) or (danh di)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((mang xa) OR (nang ma)) hoi. hieu va phan duc va ((danh vi) OR (danh di)) su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((mang xa) or (nang ma)) hoi. hieu va phan duc va ((danh vi) or (danh di)) su triet*.