Perhaps you should try some spelling variations:
chat huu » pham huu
ban hanh » ban hang
va trien » va truyen, va thiet, va tuyen
su sach » so sach
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu chat » va chat, ve chat, du chat
v nang » va nang, vu nang, van nang
vi va » vi van, vai va, vu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu sach)) v nang xa hoi. hieu vu chat huu ((van ban) or (ban hanh)) vi va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) v nang xa hoi. hieu vu chat huu ((van ban) OR (ban hanh)) vi va trien.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) v nang xa hoi. hieu vu chat huu ((van ban) or (ban hanh)) vi va trien*.