Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
cuc tre » duc tre, cua tre, cuu tre
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
sai ky » sac ky
su sai » su tai, su hai, su dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky ((lang xa) OR (dang xay)) hoi. ((hieu ve) or (hieu qua)) cam duc van hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky ((lang xa) OR (dang xay)) hoi. ((hieu ve) OR (hieu qua)) cam duc van hanh tai cuc tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky ((lang xa) OR (dang xay)) hoi. ((hieu ve) or (hieu qua)) cam duc van hanh tai cuc tre*".