Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh tai » thanh tai, hang tai, han tai
su triet » su viet, su tien, ve triet
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
cham lo » cham o, cam lo, cham soc
va hanh » van hanh, va thanh, va danh
ty tang » tay tang, ty xang, ty hang
ma hoi » xa hoi, ma hoa, me hoi
tai su » tai so, tai tu, lai su
cam o » cham o, cam lo, ca o

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty tang ((ma hoi) or (mai hoi)). hieu ve ((cham lo) or (cam o)) va hanh tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty tang ((ma hoi) OR (mai hoi)). hieu ve ((cham lo) OR (cam o)) va hanh tai su triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ty tang ((ma hoi) or (mai hoi)). hieu ve ((cham lo) or (cam o)) va hanh tai su triet*.