Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh tai, hanh van
cau phuc » cau truc, chau phu, huu phuc
phuc van » thuc van, phuc va, chuc van
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, mang xa
hanh va » hang va, hanh vi
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
sach vu » sach va, sach tu, sach uu
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 vu ((nang xa) OR (nang ma)) hoi. hieu va cau phuc van ((hanh vai) or (hanh va)) cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu ((nang xa) OR (nang ma)) hoi. hieu va cau phuc van ((hanh vai) OR (hanh va)) cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach vu ((nang xa) OR (nang ma)) hoi. hieu va cau phuc van ((hanh vai) or (hanh va)) cua su".
• Adding a wildcard symbol may retrieve word variants: tu sach vu ((nang xa) OR (nang ma)) hoi. hieu va cau phuc van ((hanh vai) or (hanh va)) cua su*.