Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
cao hoi » cau hoi, co hoi, cao hoc
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
xuc va » tuc va, luc va, xac va
vi cua » vai cua, di cua
cua te » cua tu

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 cao hoi. hieu ve cac ((xuc va) or (duc va)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ky nang cao hoi. hieu ve cac ((xuc va) OR (duc va)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) ky nang cao hoi. hieu ve cac ((xuc va) or (duc va)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) ky nang cao hoi. hieu ve cac ((xuc va) or (duc va)) hanh vi cua te*.