Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
va tinh » may tinh
vu sac » vu sach, vu san, vu cac
va sac » va cac, va suc, va san
nam tu » nam thu, nam thuc
va dan » ca dan, va dao, va dau
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: ((vu sac) OR (va sac)) ky nang x ho. hieu van nam tu ((va tinh) or (va dan)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sac) OR (va sac)) ky nang x ho. hieu van nam tu ((va tinh) OR (va dan)) ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sac) OR (va sac)) ky nang x ho. hieu van nam tu ((va tinh) or (va dan)) ki su triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sac) OR (va sac)) ky nang x ho. hieu van nam tu ((va tinh) or (va dan)) ki su triet*.