Perhaps you should try some spelling variations:
dung tri » dung tai, dung tren, dung sai
cam thue » cam thu, lam thue, nam thue
tu sach » thu sach, su sach, te sach
va dung » van dung, va duong, vat dung
thue va » thuc va, thuyet va, thuc vat
hieu va » lieu va
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
ma hoi » xa hoi, ma hoa, me hoi
cua tu » cua tuc, cua su, cua cu

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 y nang ((ma hoi) OR (mai hoi)). ((hieu va) or (hieu qua)) cam thue va dung tri cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((ma hoi) OR (mai hoi)). ((hieu va) OR (hieu qua)) cam thue va dung tri cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((ma hoi) OR (mai hoi)). ((hieu va) or (hieu qua)) cam thue va dung tri cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((ma hoi) OR (mai hoi)). ((hieu va) or (hieu qua)) cam thue va dung tri cua tu*.