Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ca tren » cau tren, la tren, co tren
hanh va » hang va, hanh vi
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
cu tren » tu tren, dua tren
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: tu sach ky sang mai khoi. hieu ve cham soc va ((hanh tai) or (hanh va)) ((ca tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang mai khoi. hieu ve cham soc va ((hanh tai) OR (hanh va)) ((ca tren) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang mai khoi. hieu ve cham soc va ((hanh tai) or (hanh va)) ((ca tren) or (cu tren))*.