Perhaps you should try some spelling variations:
tham luc » than luc, tham nuoc, tham thuc
tu sach » thu sach, su sach, te sach
xanh di » vanh dai, xanh tai
danh di » danh du, danh dien, danh gia
va tham » van tham, va cham, va thanh
sach va » sach xa, sach ha, sach dao
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
luc va » duc va, tuc va, loc va

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 va ((nang xa) or (nang ma)) hoi. hieu va tham luc va ((danh di) OR (xanh di)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach va ((nang xa) OR (nang ma)) hoi. hieu va tham luc va ((danh di) OR (xanh di)) cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach va ((nang xa) or (nang ma)) hoi. hieu va tham luc va ((danh di) OR (xanh di)) cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach va ((nang xa) or (nang ma)) hoi. hieu va tham luc va ((danh di) OR (xanh di)) cua vat*.