Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
vat hanh » vat thanh, van hanh, va hanh
hanh ky » hanh kem
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac

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 ((y nang) or (vu nang)) mai hoi. hieu ((ve cam) or (ve cac)) thuc vat hanh ky su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (vu nang)) mai hoi. hieu ((ve cam) OR (ve cac)) thuc vat hanh ky su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (vu nang)) mai hoi. hieu ((ve cam) or (ve cac)) thuc vat hanh ky su triet*.