Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
cham luc » cham soc, nhan luc, cham cuu
hanh lai » hanh lam, hanh tai, thanh lap
sach ty » sach y, sach tu, xach tay
may hoi » may thoi, tay hoi, mai hoi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
lai va » loai va, mai va, dai va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach ty) OR (sach thu)) mang may hoi. hieu ve cham luc va hanh lai va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ty) OR (sach thu)) mang may hoi. hieu ve cham luc va hanh lai va thiet".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ty) OR (sach thu)) mang may hoi. hieu ve cham luc va hanh lai va thiet*.