Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
ve chao » ve chat, ve cham, ve cho
va danh » va dinh, va dan, va hanh
mai hoi » mai khoi, dai hoi, lai hoi
vai va » mai va, hai va, lai va
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
dai va » mai va
xu va » xu van, tu va, su va
thiet » thieu

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 nang ((ma hoi) or (mai hoi)). hieu ve chao xu va danh ((vai va) or (dai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((ma hoi) OR (mai hoi)). hieu ve chao xu va danh ((vai va) OR (dai va)) thiet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((ma hoi) or (mai hoi)). hieu ve chao xu va danh ((vai va) or (dai va)) thiet*.