Perhaps you should try some spelling variations:
sach ty » sach y, sach tu, sach thu
cach tu » cach thuc
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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 ty) or (cach tu)) lang xa hoi. hieu va cac duc van minh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (cach tu)) lang xa hoi. hieu va cac duc van minh ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (cach tu)) lang xa hoi. hieu va cac duc van minh ((vi cua) or (di cua)) tre*.