Perhaps you should try some spelling variations:
hanh lam » thanh lap, hanh kem, hanh va
cham duc » pham duc, cham soc, pham duy
so sach » so sanh, bo sach, co sach
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
mai hoi » mai khoi, dai hoi, lai hoi
ty tang » tay tang, ty xang, ty hang
ma hoi » ma hoa, me hoi, va hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty tang ((((ma hoi) OR (mai hoi))) or (xa hoi)). hieu vu cham duc va hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty tang ((((ma hoi) OR (mai hoi))) OR (xa hoi)). hieu vu cham duc va hanh lam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty tang ((((ma hoi) OR (mai hoi))) or (xa hoi)). hieu vu cham duc va hanh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ty tang ((((ma hoi) OR (mai hoi))) or (xa hoi)). hieu vu cham duc va hanh lam cua tre*.