Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh ve » hanh ve, thanh va, thanh vien
xa thanh » va thanh, ha thanh, ta thanh
vien cac » vien bach, vien dai, vien da
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
ve cac » va cac
o hoc » mo hoc, so hoc, y hoc
ve su » va su

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 nang ((o hoc) or (co hoc)). hieu ((ve cac) or (vien cac)) tuc xa thanh ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((o hoc) OR (co hoc)). hieu ((ve cac) OR (vien cac)) tuc xa thanh ve su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((o hoc) or (co hoc)). hieu ((ve cac) or (vien cac)) tuc xa thanh ve su triet*.