Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hang hai » hoang hai, hang tai, thanh hai
hanh hai » thanh hai, nhanh hai, hanh tai
hieu va » lieu va, hieu qua
cau tuc » cau truc, cau tu, cau luc
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
va cau » van cau, va cac, va dau
tuc va » thuc va, truc va, tuc xa

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 ky nang x ho. hieu va cau tuc va ((hanh hai) OR (hang hai)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang x ho. hieu va cau tuc va ((hanh hai) OR (hang hai)) ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang x ho. hieu va cau tuc va ((hanh hai) OR (hang hai)) ((cua tre) or (cuu tre))*".