Perhaps you should try some spelling variations:
hanh dao » lanh dao, thanh dat, thanh dam
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
dao cua » dai cua, day cua, dan cua
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
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 ty) OR (sach thu)) nang xa hoi. hieu van ((cam tuc) or (am thuc)) va hanh dao cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang xa hoi. hieu van ((cam tuc) OR (am thuc)) va hanh dao cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach thu)) nang xa hoi. hieu van ((cam tuc) or (am thuc)) va hanh dao cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach thu)) nang xa hoi. hieu van ((cam tuc) or (am thuc)) va hanh dao cua tre*.