Perhaps you should try some spelling variations:
danh yen » danh tuyen, dan huyen, danh kien
xach tay » canh tay
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, va hanh
cac tac » cac toc, cac bac, cac dac
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
cach tu » cach thuc
cuu tre » cau tren, cau treo
tac va » tac da, tac xa, tuc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((xach tay) or (cach tu)) nang cao hoi. hieu va cac tac va danh yen ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((xach tay) OR (cach tu)) nang cao hoi. hieu va cac tac va danh yen ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((xach tay) or (cach tu)) nang cao hoi. hieu va cac tac va danh yen ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te ((xach tay) or (cach tu)) nang cao hoi. hieu va cac tac va danh yen ((cua tre) OR (cuu tre))*.