Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh di » hanh de, hang di, danh di
cac duc » cac du, cao duc, cac dac
van cac » van hac, van cau, van bac
sach ty » sach y, sach tu, sach thu
te sach » toc sach
lang xa » lang ha, dang xay, lang van
nang xa » nang x, 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: te sach ty ((nang xa) or (lang xa)) hoi. hieu van cac duc va ((hanh di) OR (hanh vi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang xa) OR (lang xa)) hoi. hieu van cac duc va ((hanh di) OR (hanh vi)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang xa) or (lang xa)) hoi. hieu van cac duc va ((hanh di) OR (hanh vi)) cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang xa) or (lang xa)) hoi. hieu van cac duc va ((hanh di) OR (hanh vi)) cua te*.