Perhaps you should try some spelling variations:
vat dung » van dung, viet dung, mat duong
cua tre » cua te, cuu tre, cua triet
danh xa » danh ca, dinh xa, dan xa
con cua » cong cua, co cua, dong cua
canh xa » canh va, canh tac, canh tay
hieu ve » hieu va, hieu van
va dung » van dung, va duong, va ung
so sac » so sach, so dac
cam tu » cam thu, nam tu, dam tu
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky ((danh xa) OR (canh xa)) hoi. hieu ve cam tu ((vat dung) or (va dung)) con cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky ((danh xa) OR (canh xa)) hoi. hieu ve cam tu ((vat dung) OR (va dung)) con cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky ((danh xa) OR (canh xa)) hoi. hieu ve cam tu ((vat dung) or (va dung)) con cua tre*".