Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
pham tu » phan tu, pham thi, pham tai
va hanh » van hanh, va thanh, va danh
vit ca » viet ca, viet cau
vi ca » li ca, va ca, vi ha

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 ky nang xa hoi. ((hieu ve) OR (hieu va)) pham tu va hanh ((vi ca) or (vit ca)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. ((hieu ve) OR (hieu va)) pham tu va hanh ((vi ca) OR (vit ca)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. ((hieu ve) OR (hieu va)) pham tu va hanh ((vi ca) or (vit ca)) tren".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. ((hieu ve) OR (hieu va)) pham tu va hanh ((vi ca) or (vit ca)) tren*.