Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
su triet » su viet, su tien, ve triet
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cham tu » cam tu, chai tu, chay tu
pham tu » phan tu, pham thi, pham tai
va danh » va dinh, va dan, va hanh
danh va » doanh va, hanh va, anh va

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