Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
lang ha » long ha
can ky » van ky, dan ky, ban ky
ve cac » va cac, vien cac
vi cua » vai cua, di cua
tu can » tu ban, tu cac, thu canh

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu can ky ((nang ma) or (lang ha)) hoi. hieu ve cac tuc ((va tinh) or (may tinh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky ((nang ma) OR (lang ha)) hoi. hieu ve cac tuc ((va tinh) OR (may tinh)) vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu can ky ((nang ma) or (lang ha)) hoi. hieu ve cac tuc ((va tinh) or (may tinh)) vi cua tre*.