Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cham tuc » nham thuc, pham thuc, cham soc
han tai » hang tai, nhan tai, van tai
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
va han » va phan, van han, va hanh
tai va » thai va, mai va, tri va
thiet* » thieu*

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) or (sach y)) tang ma hoi. hieu ve ((cham tuc) OR (tham thuc)) va han tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) tang ma hoi. hieu ve ((cham tuc) OR (tham thuc)) va han tai va thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) tang ma hoi. hieu ve ((cham tuc) OR (tham thuc)) va han tai va thiet*".