Perhaps you should try some spelling variations:
sach tham » sach nha
man tinh » may tinh, ban tinh, quan tinh
nuoc man » nuoc mat, nuoc san, nuoc dan
hac nuoc » hoc nuoc, cac nuoc, phap nuoc
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, cach thuc
tinh va » tich va, trinh van, trinh vat
van hac » van hoc, van ha, van hai
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach thu) OR (sach tham)) nang ((ma hoi) or (mai hoi)). hieu van hac nuoc man tinh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach tham)) nang ((ma hoi) OR (mai hoi)). hieu van hac nuoc man tinh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) OR (sach tham)) nang ((ma hoi) or (mai hoi)). hieu van hac nuoc man tinh va cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) OR (sach tham)) nang ((ma hoi) or (mai hoi)). hieu van hac nuoc man tinh va cua te*.