Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
cu tren » dua tren
va danh » va dinh, va dan, va hanh
cam duc » cam xuc, cao duc, pham duc
tu tren » tu truyen, tu tieng, tu trong
hieu va » hieu qua
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu nang xa hoi. ((hieu va) or (lieu va)) cam duc va danh vai ((cu tren) OR (tu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang xa hoi. ((hieu va) OR (lieu va)) cam duc va danh vai ((cu tren) OR (tu tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu nang xa hoi. ((hieu va) or (lieu va)) cam duc va danh vai ((cu tren) OR (tu tren))*".