Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
dua tren » dung tren
hanh tai » thanh tai, hang tai, han tai
hanh lai » hanh lam, thanh lap, thanh loi
thu nang » thi nang, thu hang, thu bang
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach
ve cam » ve cham, ve cac, va cam

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 ve cam duc tan ((hanh lai) or (hanh tai)) ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang xa hoi. hieu ve cam duc tan ((hanh lai) OR (hanh tai)) ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang xa hoi. hieu ve cam duc tan ((hanh lai) or (hanh tai)) ((dua tren) or (cua triet))*.