Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cac tu » cac thu, cach tu, cac du
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu 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 thu nang xa hoi. hieu va cac tu va hanh ((di cua) OR (de cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang xa hoi. hieu va cac tu va hanh ((di cua) OR (de cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang xa hoi. hieu va cac tu va hanh ((di cua) OR (de cua)) tre*.