Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
thu nang » thi nang, thu hang, thu bang
dieu cua » dieu tra
nang xa » nang x, lang xa, nang ma
nam qua » nam quan, nam cua, nam mua
qua anh » qua danh, sua anh, qua thanh
de cua » le cua, te cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) thu nang xa hoi. thien van nam qua anh tuan ((de cua) OR (dieu cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) thu nang xa hoi. thien van nam qua anh tuan ((de cua) OR (dieu cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) thu nang xa hoi. thien van nam qua anh tuan ((de cua) OR (dieu cua)) te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) thu nang xa hoi. thien van nam qua anh tuan ((de cua) OR (dieu cua)) te*.