Perhaps you should try some spelling variations:
ban thanh » ban hang
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
tru nang » tra nang, tri nang, truc nano
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
tu nang » tu nong, tu nano, tu lang
luu tre » luu tru, cuu tre, luy tre
vi luu » vi lua

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 ((tu nang) OR (tru nang)) xa hoi. hieu va cham duc ((ban thanh) or (ban hanh)) vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((tu nang) OR (tru nang)) xa hoi. hieu va cham duc ((ban thanh) OR (ban hanh)) vi luu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((tu nang) OR (tru nang)) xa hoi. hieu va cham duc ((ban thanh) or (ban hanh)) vi luu tre*".