Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
nam xuc » cam xuc, nam xua, nam thuc
va dinh » van dinh, va kinh, va tinh
dinh ve » dinh ket, dinh van
xuc va » duc va, tuc va, luc va
ve cau » ke cau, va cau, ve cac
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: ((tu cac) or (((thu sach) OR (thuoc sach)))) ky nang x hoi. hieu van nam xuc va dinh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (((thu sach) OR (thuoc sach)))) ky nang x hoi. hieu van nam xuc va dinh ve cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cac) or (((thu sach) OR (thuoc sach)))) ky nang x hoi. hieu van nam xuc va dinh ve cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (((thu sach) OR (thuoc sach)))) ky nang x hoi. hieu van nam xuc va dinh ve cau tren*.