Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
dinh dai » dinh dat, sinh dai, dinh dao
hieu van » thien van, lieu va, hieu ve
chat xuc » chat huu, cam xuc, chao xu
dai cuu » dai cua, dai huu
va dinh » van dinh, va kinh, va tinh
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
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: ((thu sach) OR (thuoc sach)) ky nang xa hoi. ((hieu van) or (hieu va)) chat xuc va dinh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ky nang xa hoi. ((hieu van) OR (hieu va)) chat xuc va dinh dai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) ky nang xa hoi. ((hieu van) or (hieu va)) chat xuc va dinh dai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) ky nang xa hoi. ((hieu van) or (hieu va)) chat xuc va dinh dai cuu tre*.