Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan, thuc vat
cuu thuc » cuu tac
tu sach » thu sach, su sach, te sach
hanh de » hanh ve, hanh kem
hanh te » hanh tu, hanh ve, hanh he
van cuu » van cau, van chu, van cu
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
cua te » cua tu

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) or (nang x)) hoi. hieu van cuu thuc dan ((hanh te) OR (hanh de)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang x)) hoi. hieu van cuu thuc dan ((hanh te) OR (hanh de)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (nang x)) hoi. hieu van cuu thuc dan ((hanh te) OR (hanh de)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang x)) hoi. hieu van cuu thuc dan ((hanh te) OR (hanh de)) cua te*.