Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
van hanh » ban hanh, van anh, van ban
chau tre » chay tren, chau tho, cho tre
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang xa hoi. ((hieu ve) or (lieu va)) cam xuc ((van hanh) OR (van thanh)) lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. ((hieu ve) OR (lieu va)) cam xuc ((van hanh) OR (van thanh)) lai chau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang xa hoi. ((hieu ve) or (lieu va)) cam xuc ((van hanh) OR (van thanh)) lai chau tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. ((hieu ve) or (lieu va)) cam xuc ((van hanh) OR (van thanh)) lai chau tre*.