Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
den su » dan su, nen su
de su » ve su, de tu, da su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang xa hoi. hieu va pham duc va thanh ((de su) or (den su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu va pham duc va thanh ((de su) OR (den su)) triet.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu va pham duc va thanh ((de su) or (den su)) triet*.