Perhaps you should try some spelling variations:
vanh tri » van tri, vanh tai, thanh tri
tu sach » thu sach, te sach, tu cach
va vanh » va van, va danh, va hanh
cao luc » bao luc, cao duc, cao suc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
su sach » so sach, vu sach
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu

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 (su sach)) ky lang xa hoi. hieu va cao luc va vanh tri ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky lang xa hoi. hieu va cao luc va vanh tri ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky lang xa hoi. hieu va cao luc va vanh tri ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky lang xa hoi. hieu va cao luc va vanh tri ((cua te) OR (cua tu))*.