Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
hieu van » hieu va, thien van, lieu va
manh hai » minh hai, thanh hai, van hai
lanh hai » thanh hai, lang chai, lanh dao
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
nam tu » nam thu
ma hoi » mai hoi, xa hoi, ma hoa

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 nang ma hoi. hieu van ((nam tu) or (nam thuc)) va ((lanh hai) OR (manh hai)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. hieu van ((nam tu) OR (nam thuc)) va ((lanh hai) OR (manh hai)) cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. hieu van ((nam tu) or (nam thuc)) va ((lanh hai) OR (manh hai)) cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. hieu van ((nam tu) or (nam thuc)) va ((lanh hai) OR (manh hai)) cau treo*.