Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh dai » danh dau, danh di, danh sai
van chat » cao chat
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, mang xa
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day

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 ty ((nang xa) or (nang ma)) hoi. hieu van chat ((truc va) OR (thuc va)) danh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (nang ma)) hoi. hieu van chat ((truc va) OR (thuc va)) danh dai cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang xa) or (nang ma)) hoi. hieu van chat ((truc va) OR (thuc va)) danh dai cua viet*".