Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
va triet » va thiet, va trien, ve triet
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
dua tren » dung tren
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
ve cham » va cham, ve chat, vu cham
ve cac » va cac, vien cac

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 tru nang xa hoi. hieu ((ve cac) or (ve cham)) suc manh hanh vai ((dua tren) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tru nang xa hoi. hieu ((ve cac) OR (ve cham)) suc manh hanh vai ((dua tren) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach tru nang xa hoi. hieu ((ve cac) or (ve cham)) suc manh hanh vai ((dua tren) or (va triet))*.