Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu nang » thi nang, thu hang, thu bang
qua cham » qua hai, qua cac, qua cua
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
nang xa » nang x, lang xa, nang ma
hanh de » hanh ve, hanh kem
va cham » va chat, va tham
de cua » le cua, te cua, dieu 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: ((te sach) or (toc sach)) thu nang xa hoi. hieu ((qua cham) OR (va cham)) luc van hanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) thu nang xa hoi. hieu ((qua cham) OR (va cham)) luc van hanh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) thu nang xa hoi. hieu ((qua cham) OR (va cham)) luc van hanh de cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) thu nang xa hoi. hieu ((qua cham) OR (va cham)) luc van hanh de cua te*.