Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
tham duc » pham duc, tham du, than duc
vu sach » vu bach, su sach, vu khach
cua tre » cuu tre, cua triet, dua tren
sach ty » sach y, sach tu, sach thu
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua te » cua tu

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 ty nang xa hoi. hieu va tham duc ((ban thanh) or (ban hanh)) vai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang xa hoi. hieu va tham duc ((ban thanh) OR (ban hanh)) vai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang xa hoi. hieu va tham duc ((ban thanh) or (ban hanh)) vai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang xa hoi. hieu va tham duc ((ban thanh) or (ban hanh)) vai ((cua tre) OR (cua te))*.