Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hanh dao » lanh dao, thanh dat, thanh dam
hieu va » lieu va, hieu qua
dao cua » dai cua, day cua, dan cua
xa hanh » xa thanh, xa khanh, va hanh
cam tuc » cam xuc, cam tu, nam thuc
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
dai hoa » dai khoa, dai hoc, dai hoi
lai hoa » loai hoc
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: so sach ky nang ((lai hoa) OR (dai hoa)). ((hieu van) or (hieu va)) cam tuc xa hanh dao cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((lai hoa) OR (dai hoa)). ((hieu van) OR (hieu va)) cam tuc xa hanh dao cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang ((lai hoa) OR (dai hoa)). ((hieu van) or (hieu va)) cam tuc xa hanh dao cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((lai hoa) OR (dai hoa)). ((hieu van) or (hieu va)) cam tuc xa hanh dao cua tre*.