Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hoang hai » hoang thi, hoang van
hang hai » hang tai, thanh hai, hang va
hieu van » hieu va, thien van, lieu va
van cau » van dau, van hau, van chat
cau tuc » cau truc, cau tu, cau luc
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y nang x ho. hieu van cau tuc va ((hang hai) OR (hoang hai)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang x ho. hieu van cau tuc va ((hang hai) OR (hoang hai)) ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang x ho. hieu van cau tuc va ((hang hai) OR (hoang hai)) ((cua tre) or (cuu tre))*".