Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thuc va » thuc dan, thuc day
su sach » so sach, vu sach
van hoi » van hoa, van hoc, van hoe
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
y nang » ky nang, v nang, may nang
va nam » van nam, ha nam, va nay
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: su sach ((y nang) or (ly nang)) van hoi. hieu va nam ((thuc va) OR (thuc vat)) hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) van hoi. hieu va nam ((thuc va) OR (thuc vat)) hanh vi su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (ly nang)) van hoi. hieu va nam ((thuc va) OR (thuc vat)) hanh vi su triet*".