Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hanh tai » thanh tai, hang tai, han tai
thu nang » thi nang, thu hang, thu bang
va hanh » van hanh, va thanh, va danh
cham lo » cham o, cam lo, cham soc
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
cuc tre » duc tre, cua tre, cuu tre
mai hoi » mai khoi, dai hoi, lai hoi
tu sach » su sach, te sach, tu cach
ma hoi » xa hoi, ma hoa, me hoi
lo va » lo van, lao va, ly va

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

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