Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
thai cua » than cua, tai cuc, tri cua
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly 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 (tu sach)) ky nang xa hoi. hieu ve cac lo va hanh ((thai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang xa hoi. hieu ve cac lo va hanh ((thai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky nang xa hoi. hieu ve cac lo va hanh ((thai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ky nang xa hoi. hieu ve cac lo va hanh ((thai cua) or (dai cua)) tre*.