Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
cam duc » cam xuc, cao duc, pham duc
va dinh » van dinh, va kinh, va tinh
vai cua » hai cua, lai cua, bai cua
y nang » ky nang, ly nang, v nang

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

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