Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
cham duc » pham duc, cham soc, pham duy
sang tao » hang tai
hanh dao » lanh dao, thanh dat, doanh dao
sach duy » sach dung, sach duoc, sach dao
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
sang ma » tang ma, nang ma, mang may
cua tre » cua te, cuu tre, cua triet

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 duy ((sang ma) or (sang tao)) hoi. hieu va cham duc va ((hanh dao) OR (thanh dam)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach duy ((sang ma) OR (sang tao)) hoi. hieu va cham duc va ((hanh dao) OR (thanh dam)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach duy ((sang ma) or (sang tao)) hoi. hieu va cham duc va ((hanh dao) OR (thanh dam)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach duy ((sang ma) or (sang tao)) hoi. hieu va cham duc va ((hanh dao) OR (thanh dam)) cua tre*.