Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

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 van cau truc va danh ((di cua) or (de 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 van cau truc va danh ((di cua) OR (de cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky nang xa hoi. hieu van cau truc va danh ((di cua) or (de cua)) tre*.