Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
va tinh » may tinh
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
nam tu » nam thu, nam thuc
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 sach y nang x ho. hieu van nam tu ((va tinh) or (va hanh)) ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y nang x ho. hieu van nam tu ((va tinh) OR (va hanh)) ki su triet.
• Adding a wildcard symbol may retrieve word variants: vu sach y nang x ho. hieu van nam tu ((va tinh) or (va hanh)) ki su triet*.