Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dan hanh » dang hanh, dan khanh, dan thanh
thuc dan » thuc hanh, hoc dan, thuc vat
hanh de » hanh ve, hanh kem
su sach » vu sach
so sach » so sanh, bo sach, co sach
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
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) OR (so sach)) y nang x hoi. hieu ((ve cam) or (ve cac)) thuc dan hanh de su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang x hoi. hieu ((ve cam) OR (ve cac)) thuc dan hanh de su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) y nang x hoi. hieu ((ve cam) or (ve cac)) thuc dan hanh de su triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) y nang x hoi. hieu ((ve cam) or (ve cac)) thuc dan hanh de su triet*.