Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
tinh hai » tinh thai, tinh chat, trinh han
cac duc » cac du, cao duc, cac dac
cuu tre » cua tre, cau tren
va tinh » may tinh
te sach » toc sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, mang may
ve cac » va cac, vien cac

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

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