Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
cuu tac » cuu dac, cuu cac, cuu xac
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
tac va » tac da, tac xa, tuc va
vi cuu » vi luu, vinh cuu
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 ly nang x hoi. ((((hieu ve) or (hieu van))) or (hieu va)) cuu tac va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly nang x hoi. ((((hieu ve) OR (hieu van))) OR (hieu va)) cuu tac va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ly nang x hoi. ((((hieu ve) or (hieu van))) or (hieu va)) cuu tac va hanh vi cuu tre*.