Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
va lang » va nang, hoa lang
chai tu » cai tu, choi tu, chi tu
chay tu » chay tui, chay dua
va nam » van nam, ha nam, va nay
thu va » thuc va, thue va, tu 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 ((ty nang) or (ky nang)) xa hoi. hieu va nam thu va lang ((chai tu) OR (chay tu)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ky nang)) xa hoi. hieu va nam thu va lang ((chai tu) OR (chay tu)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) or (ky nang)) xa hoi. hieu va nam thu va lang ((chai tu) OR (chay tu)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ky nang)) xa hoi. hieu va nam thu va lang ((chai tu) OR (chay tu)) triet*.