Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
tai hoi » tai khoi, dai hoi, tai hai
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, hoi cua, lai cua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang tai hoi. hieu va cac luc va hanh ((hai cua) OR (dai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang tai hoi. hieu va cac luc va hanh ((hai cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang tai hoi. hieu va cac luc va hanh ((hai cua) OR (dai cua)) tre*.