Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
dang xay » dang van, van xay
va thanh » gia thanh, ban thanh, va tinh
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, lang van
hieu va » lieu va, hieu qua
bac hoc » bai hoc, bac ho
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
va bac » van bac, va cac, va bai
cuc te » cua te, cuc thue, cuc tieu

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

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