Perhaps you should try some spelling variations:
hang hai » hoang hai, hang tai, thanh hai
hai cuu » hai cua, hai chu, hai cuc
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach kem
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sach ty)) nang xa hoi. hieu va cac ((duc ban) or (duc van)) hang hai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) nang xa hoi. hieu va cac ((duc ban) OR (duc van)) hang hai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach ty)) nang xa hoi. hieu va cac ((duc ban) or (duc van)) hang hai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach ty)) nang xa hoi. hieu va cac ((duc ban) or (duc van)) hang hai cuu tre*.