Perhaps you should try some spelling variations:
tham nuoc » thay nuoc, thoat nuoc, nha nuoc
van tham » van thanh, van tuan, van chat
hieu van » hieu va, thien van, lieu va
hang doi » hang loi, huong doi, hang tai
hang di » hang vi, hang dien, hang dich
so sanh » do sanh
nang xa » lang xa, nang ma, mang xa
sanh vu » anh vu, hanh vu, sanh va
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: so sanh vu ((nang xa) OR (nang x)) hoi. hieu van tham nuoc va ((hang di) or (hang doi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh vu ((nang xa) OR (nang x)) hoi. hieu van tham nuoc va ((hang di) OR (hang doi)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh vu ((nang xa) OR (nang x)) hoi. hieu van tham nuoc va ((hang di) or (hang doi)) cua te".
• Adding a wildcard symbol may retrieve word variants: so sanh vu ((nang xa) OR (nang x)) hoi. hieu van tham nuoc va ((hang di) or (hang doi)) cua te*.