Perhaps you should try some spelling variations:
hien hach » thien hach, hien hanh, hien nhanh
hieu hien » bieu hien, dieu hien, chieu chien
hach xuc » thach duc, hanh xu, cach xu
thu sach » thuat sach, thuoc sach, thu hoach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
tu sach » su sach, te sach, tu cach
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
va cau » van cau, va dau, va cao

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) OR (thu sach)) y nang xa hoi. hieu hien hach xuc va hanh ((va cau) or (va cac)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. hieu hien hach xuc va hanh ((va cau) OR (va cac)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang xa hoi. hieu hien hach xuc va hanh ((va cau) or (va cac)) tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang xa hoi. hieu hien hach xuc va hanh ((va cau) or (va cac)) tren*.