Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
hanh dao » lanh dao, thanh dat, doanh dao
tu sach » thu sach, su sach, te sach
luc bat » suc bat, luc nhat, luat bat
cau luc » cau truc, cau phuc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, mang may
va cau » van cau, va cac, va dau
cua su » qua su

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