Perhaps you should try some spelling variations:
thien van » thi van
cau treo » cau theo, cau tren, cau triet
lanh hai » manh hai, thanh hai, lang chai
hieu van » hieu va, lieu va, hieu ve
truc va » thuc va, thuc vat, trung va
hai cau » hai chau, hai chu, hai hau
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
tuc va » thuc va, tuc xa, duc va
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) OR (thien van)) cam ((tuc va) or (truc va)) lanh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ma hoi. ((hieu van) OR (thien van)) cam ((tuc va) OR (truc va)) lanh hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ma hoi. ((hieu van) OR (thien van)) cam ((tuc va) or (truc va)) lanh hai cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ma hoi. ((hieu van) OR (thien van)) cam ((tuc va) or (truc va)) lanh hai cau treo*.