Perhaps you should try some spelling variations:
de triet » ve triet, de thiet, su triet
sach duy » sach dung, sach duoc, sach dao
duy sang » duy van, duy can, duy anh
hieu luc » hieu luat, hieu qua
gian cac » gian dan, gian cua
dan van » dang van, doan van, dao van
vien da » vien dai, hien dai
te sach » toc sach
sang ma » tang ma, nang ma, sang tao
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » duc va, tuc va, luc va
va dan » ca dan, va dao, va dau

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 duy sang ma hoi. thien ((hieu luc) or (((gian cac) or (vien da)))) xuc va dan van de triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach duy sang ma hoi. thien ((hieu luc) OR (((gian cac) OR (vien da)))) xuc va dan van de triet.
• Adding a wildcard symbol may retrieve word variants: te sach duy sang ma hoi. thien ((hieu luc) or (((gian cac) or (vien da)))) xuc va dan van de triet*.