Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
thuc dan » thuc hanh, hoc dan, thuc vat
thanh de » hanh de, thanh ve, thanh do
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
le nam » ly nam, he nam, te nam
cua tu » cua tuc, cua su, cua cu
le na » le va, le ta, le ha

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 y nang xa hoi. hieu ((le nam) OR (le na)) thuc dan thanh de ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang xa hoi. hieu ((le nam) OR (le na)) thuc dan thanh de ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y nang xa hoi. hieu ((le nam) OR (le na)) thuc dan thanh de ((cua te) or (cua tu))".
• Adding a wildcard symbol may retrieve word variants: vu sach y nang xa hoi. hieu ((le nam) OR (le na)) thuc dan thanh de ((cua te) or (cua tu))*.