Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat, trung va
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 v nang xa hoi. ((hieu ve) or (hieu va)) cau truc va hanh ((lai cua) OR (hai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang xa hoi. ((hieu ve) OR (hieu va)) cau truc va hanh ((lai cua) OR (hai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang xa hoi. ((hieu ve) or (hieu va)) cau truc va hanh ((lai cua) OR (hai cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. ((hieu ve) or (hieu va)) cau truc va hanh ((lai cua) OR (hai cua)) te*.