Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
duc van » duc va, duc tan, duc manh
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
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: su ((sach thu) or (cach thuc)) lang xa hoi. hieu ve cam duc van hanh ((vai cua) or (lai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thu) OR (cach thuc)) lang xa hoi. hieu ve cam duc van hanh ((vai cua) OR (lai cua)) triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach thu) or (cach thuc)) lang xa hoi. hieu ve cam duc van hanh ((vai cua) or (lai cua)) triet*.