Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, hoang mai
hanh vai » hanh vi, hanh tai, hanh van
lang mai » lang dai, lang hai, lang man
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cu tren » tu tren, dua tren

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) or (lang mai)) hoi. hieu ve cham duc va ((hanh vai) or (hanh va)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((sang mai) OR (lang mai)) hoi. hieu ve cham duc va ((hanh vai) OR (hanh va)) cu tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((sang mai) or (lang mai)) hoi. hieu ve cham duc va ((hanh vai) or (hanh va)) cu tren*.