Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
dat cua » dai cua, day cua, dan cua
mat cua » ma cua, manh cua, mang cua
va cau » van cau, va cac, va dau

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 ty nang xa hoi. lieu va cau ((truc va) or (thuc va)) thanh ((dat cua) OR (mat cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. lieu va cau ((truc va) OR (thuc va)) thanh ((dat cua) OR (mat cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. lieu va cau ((truc va) or (thuc va)) thanh ((dat cua) OR (mat cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. lieu va cau ((truc va) or (thuc va)) thanh ((dat cua) OR (mat cua)) tre*.