Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
vien cac » vien bach, vien dai, vien da
va thanh » gia thanh, ban thanh, va tinh
xa thanh » ha thanh, ta thanh, gia thanh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
ve cac » va cac
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai
vi su » va su, ve su, ki su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang o hoi. hieu ((ve cac) or (vien cac)) tuc ((xa thanh) OR (va thanh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang o hoi. hieu ((ve cac) OR (vien cac)) tuc ((xa thanh) OR (va thanh)) vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang o hoi. hieu ((ve cac) or (vien cac)) tuc ((xa thanh) OR (va thanh)) vi su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang o hoi. hieu ((ve cac) or (vien cac)) tuc ((xa thanh) OR (va thanh)) vi su triet*.