Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, dan bac
van hac » van hoc, van ha, van hai
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: tu sach ky nang xa hoi. hieu ((van bac) or (van hac)) truc va danh ((di cua) OR (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((van bac) OR (van hac)) truc va danh ((di cua) OR (de cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((van bac) or (van hac)) truc va danh ((di cua) OR (de cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((van bac) or (van hac)) truc va danh ((di cua) OR (de cua)) tre*.