Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
chu duc » thu duc, chua duoc, cuu duoc
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
vi cua » di cua

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 ly nang xa hoi. ((hieu ve) or (hieu va)) chu duc va dinh ((vi cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang xa hoi. ((hieu ve) OR (hieu va)) chu duc va dinh ((vi cua) OR (vai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang xa hoi. ((hieu ve) or (hieu va)) chu duc va dinh ((vi cua) or (vai cua)) tre*.