Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tham luc » than luc, tham nuoc, tham thuc
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
cuu tre » cua tre, cau tren, cau treo
sach v » sach va, sach y, sach 2
luc va » duc va, tuc va, loc va
va dau » va dao
dau du » dau tu, day du, dao du
du cuu » tu cuu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach v ((nang xa) or (nang ma)) hoi. hieu va tham luc va dau du cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v ((nang xa) OR (nang ma)) hoi. hieu va tham luc va dau du cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach v ((nang xa) or (nang ma)) hoi. hieu va tham luc va dau du cuu tre*.