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