Perhaps you should try some spelling variations:
duc toan » duc tan, duc ton, duc thang
duc hoan » duc hoang, duc hoa, duc thuan
te sach » toc sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang xa hoi. hieu va giao ((duc toan) OR (duc hoan)) hanh ((vai cua) OR (hai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang xa hoi. hieu va giao ((duc toan) OR (duc hoan)) hanh ((vai cua) or (hai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang xa hoi. hieu va giao ((duc toan) OR (duc hoan)) hanh ((vai cua) or (hai cua)) tre*.