Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh vai » danh sai, danh va, doanh van
chat xuc » chat huu, cam xuc, chao xu
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) ky nang ma hoi. ((hieu van) OR (hieu va)) chat xuc va danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky nang ma hoi. ((hieu van) OR (hieu va)) chat xuc va danh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky nang ma hoi. ((hieu van) OR (hieu va)) chat xuc va danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky nang ma hoi. ((hieu van) OR (hieu va)) chat xuc va danh vai cua tre*.