Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
dinh hai » dinh thai, tinh hai, dinh ha
te sach » toc sach
nang xa » lang xa, nang ma, mang xa
dai lao » dai lan, dai thao, dai luan
va dinh » van dinh, va kinh, va tinh
lao va » tao va, cao va, bao va
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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 y ((nang xa) or (nang x)) hoi. hieu hien dai lao va dinh hai ((cua tu) OR (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((nang xa) OR (nang x)) hoi. hieu hien dai lao va dinh hai ((cua tu) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((nang xa) or (nang x)) hoi. hieu hien dai lao va dinh hai ((cua tu) OR (cua su))".
• Adding a wildcard symbol may retrieve word variants: te sach y ((nang xa) or (nang x)) hoi. hieu hien dai lao va dinh hai ((cua tu) OR (cua su))*.