Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
vat hanh » vat thanh, van hanh, va hanh
hanh de » hanh ve, hanh kem
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
nang co » nang doc, nang noi, nang hoc
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
de su » den su, ve su, de tu

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