Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
hanh hai » thanh hai, nhanh hai, hang hai
truc va » thuc va, thuc vat, trung va
nang ma » tang ma, sang ma, nang cao
cuu tre » cua tre, cau treo
van cam » van nam, van lam, van cau
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc 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: tu sac ky nang ma hoi. hieu van cam ((xuc va) or (truc va)) hanh hai ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ma hoi. hieu van cam ((xuc va) OR (truc va)) hanh hai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ma hoi. hieu van cam ((xuc va) or (truc va)) hanh hai ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu van cam ((xuc va) or (truc va)) hanh hai ((cuu tre) OR (cau tren))*.