Perhaps you should try some spelling variations:
thuoc tai » nuoc tai, hoc tai, thuc tap
hieu van » hieu va, thien van, lieu va
thanh va » thanh van, hanh va, thanh ha
thuoc ma » hoc ma, duoc ma
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va cua » va chua, via cua, ca cua
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 ky lang xa hoi. ((hieu ve) OR (hieu van)) nam ((thuoc tai) or (thuoc ma)) thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky lang xa hoi. ((hieu ve) OR (hieu van)) nam ((thuoc tai) OR (thuoc ma)) thanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky lang xa hoi. ((hieu ve) OR (hieu van)) nam ((thuoc tai) or (thuoc ma)) thanh va cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ky lang xa hoi. ((hieu ve) OR (hieu van)) nam ((thuoc tai) or (thuoc ma)) thanh va cua te*.