Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
chu tren » cu tren, cau tren, chu trang
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
van cau » van dau, van hau, van chat
cau luc » cau truc, cau phuc
hai chu » hai chau, hoi chu, hai chi
te sach » toc sach
luc va » duc va, tuc va, loc va

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) or (thu hoach)) ky ((nang xa) OR (nang ma)) hoi. hieu van cau luc va thanh hai chu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu hoach)) ky ((nang xa) OR (nang ma)) hoi. hieu van cau luc va thanh hai chu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu hoach)) ky ((nang xa) OR (nang ma)) hoi. hieu van cau luc va thanh hai chu tren".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu hoach)) ky ((nang xa) OR (nang ma)) hoi. hieu van cau luc va thanh hai chu tren*.