Perhaps you should try some spelling variations:
thanh tri » thanh tra, thanh tai, chinh tri
thanh thi » thanh tai, nhanh thi, thanh thu
cham duc » pham duc, cham soc, pham duy
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang xa) OR (nang ma)) hoi. hieu ve cham duc van ((thanh thi) or (thanh tri)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (nang ma)) hoi. hieu ve cham duc van ((thanh thi) OR (thanh tri)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang xa) OR (nang ma)) hoi. hieu ve cham duc van ((thanh thi) or (thanh tri)) cua tre*".