Perhaps you should try some spelling variations:
kham duc » pham duc, kham cuoc, pham duy
dinh lam » dinh van, tinh lao
xanh lam » hanh lam, xanh a, van lam
su sach » so sach, vu sach
duc van » duc va, duc tan, duc manh
vu kham » vu khanh
sach ty » sach y, sach tu, sach thu
hieu vu » hieu va, hieu ve, hieu su
ty tang » tay tang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi

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 tang ((ma hoi) or (xa hoi)). hieu vu kham duc van ((xanh lam) OR (dinh lam)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty tang ((ma hoi) OR (xa hoi)). hieu vu kham duc van ((xanh lam) OR (dinh lam)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty tang ((ma hoi) or (xa hoi)). hieu vu kham duc van ((xanh lam) OR (dinh lam)) cua tre*".