Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
ban hanh » ban hang
tu sach » su sach, te sach, tu cach
duc ban » duc tan, duc van, dua ban
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) ky nang xa hoi. hieu va cam duc ban hanh ((vai cua) OR (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang xa hoi. hieu va cam duc ban hanh ((vai cua) OR (hai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang xa hoi. hieu va cam duc ban hanh ((vai cua) OR (hai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang xa hoi. hieu va cam duc ban hanh ((vai cua) OR (hai cua)) tre*.