Perhaps you should try some spelling variations:
tai nhanh » tai thanh, thai thanh, tai chinh
dai nang » dai dang, dai thang, ki nang
tu sach » thu sach, su sach, te sach
duc tai » duc thai, luc tai, duc tan
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
da nang » cam nang, kha nang, cao nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((dai nang) OR (da nang)) xa hoi. hieu va cac duc tai nhanh ((hai cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((dai nang) OR (da nang)) xa hoi. hieu va cac duc tai nhanh ((hai cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((dai nang) OR (da nang)) xa hoi. hieu va cac duc tai nhanh ((hai cua) or (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((dai nang) OR (da nang)) xa hoi. hieu va cac duc tai nhanh ((hai cua) or (hoi cua)) tre*.