Perhaps you should try some spelling variations:
va hanh » van hanh, va thanh, va danh
lang xa » lang ha, dang xay, lang van
lai cua » dai cua, hai cua, lai chau
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, bai cua
cac loc » cac lop, cac toc, cac hoc
tu sac » tu sach, tu cac, tu san
ve cac » va cac, vien cac
loc va » hoc va, luc va
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((lang xa) or (van xay)) hoi. hieu ve cac loc va hanh ((vai cua) OR (lai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((lang xa) OR (van xay)) hoi. hieu ve cac loc va hanh ((vai cua) OR (lai cua)) te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((lang xa) or (van xay)) hoi. hieu ve cac loc va hanh ((vai cua) OR (lai cua)) te*".