Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
thuoc ma » hoc ma, duoc ma
thuoc va » thuc va, thuong va, thuoc tai
sach ky » sac ky, sach y, sach ty
vu sach » vu bach, su sach, vu khach
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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