Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
thuc day » thuc dan, thuc vat
dang van » hoang van, hang va
thuc va » thuc vat, thuc dan
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
te sach » toc sach
va cach » va cac
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) or (te sach)) ky dang van hoi. hieu va cach ((thuc va) OR (thuc day)) thanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky dang van hoi. hieu va cach ((thuc va) OR (thuc day)) thanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky dang van hoi. hieu va cach ((thuc va) OR (thuc day)) thanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky dang van hoi. hieu va cach ((thuc va) OR (thuc day)) thanh vi su triet*.