Perhaps you should try some spelling variations:
danh yen » danh tuyen, dan huyen, danh kien
xach tay » canh tay
yen cua » ben cua, gen cua, men cua
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cuu tre, cua triet
tac va » tac xa, tuc va, tac ha

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