Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh ki » thanh kim, thanh ky, thanh ke
xa thanh » va thanh, ha thanh, ta thanh
vien cac » vien bach, vien dai, vien da
sach ty » sach tu, sach thu, xach tay
nang ho » nang hoc, nang co, tang ho
ho hoi » hoc hoi, hoa hoi, hoi hoi
ve cac » va cac
ki su » ky 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) OR (sach y)) nang ho hoi. hieu ((ve cac) or (vien cac)) tuc xa thanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang ho hoi. hieu ((ve cac) OR (vien cac)) tuc xa thanh ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) nang ho hoi. hieu ((ve cac) or (vien cac)) tuc xa thanh ki su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) nang ho hoi. hieu ((ve cac) or (vien cac)) tuc xa thanh ki su triet*.