Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
hieu van » hieu va, thien van, lieu va
bac nuoc » cac nuoc, bach tuoc, sach nuoc
man tinh » ban tinh, quan tinh, doan tinh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, van hac
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: tu sach thi nang xa hoi. hieu van bac nuoc ((man tinh) OR (may tinh)) va cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi nang xa hoi. hieu van bac nuoc ((man tinh) OR (may tinh)) va cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang xa hoi. hieu van bac nuoc ((man tinh) OR (may tinh)) va cua te*.