Perhaps you should try some spelling variations:
ve triet » va trien, su triet
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
pham huu » pham duc, pham duy, phan huy
hieu su » hieu sau, tieu su, hieu so
hanh gi » hanh vi, danh gia, hanh noi
huu van » cuu van, huu han, luu van
tu sach » su sach, te sach, tu cach
hieu vu » hieu va, hieu ve, dieu vu
nang xa » nang x, lang xa, nang ma
gi ve » gia ve, gi de, gi he

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