Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky sang mai hoi. hieu ve cham soc va hanh ((ly cua) or (le cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky sang mai hoi. hieu ve cham soc va hanh ((ly cua) OR (le cua)) tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky sang mai hoi. hieu ve cham soc va hanh ((ly cua) or (le cua)) tre*.