Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
ty nang » ky nang, ty xang, ty hang
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
hac du » han du, hac de, hoc du
x hoi » xa hoi, o hoi, x ho

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) or (thuat sach)) ty nang x hoi. hieu van ((hac du) OR (cac du)) va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ty nang x hoi. hieu van ((hac du) OR (cac du)) va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat sach)) ty nang x hoi. hieu van ((hac du) OR (cac du)) va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) ty nang x hoi. hieu van ((hac du) OR (cac du)) va hanh dai cua tre*.