Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh tai » thanh hai, thanh toan, doanh tai
hanh lai » hanh lam, hanh tai, thanh lap
pham duy » pham duc
hieu va » lieu va
sach ty » sach y, sach tu, sach thu
xang ma » tang ma, nang ma, sang ma
tu sach » thu sach, su sach, te sach
duy va » duy vat, duy van, day va
ma hoi » mai hoi, xa hoi, ma hoa

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 ty xang ma hoi. ((hieu va) OR (hieu qua)) pham duy va ((hanh lai) or (thanh tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang ma hoi. ((hieu va) OR (hieu qua)) pham duy va ((hanh lai) OR (thanh tai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty xang ma hoi. ((hieu va) OR (hieu qua)) pham duy va ((hanh lai) or (thanh tai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang ma hoi. ((hieu va) OR (hieu qua)) pham duy va ((hanh lai) or (thanh tai)) cua triet*.