Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
bac hoc » bai hoc, bac ho
nang xa » nang x, lang xa, nang ma
tu san » thu san, tu ban, tu can
va bac » van bac, va cac, va bai
san ky » sang ky, van ky, dan ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky ((nang xa) or (dang xay)) hoi. hieu va bac hoc va ((thanh dai) or (thanh san)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((nang xa) OR (dang xay)) hoi. hieu va bac hoc va ((thanh dai) OR (thanh san)) cua te.
• Adding a wildcard symbol may retrieve word variants: tu san ky ((nang xa) or (dang xay)) hoi. hieu va bac hoc va ((thanh dai) or (thanh san)) cua te*.