Perhaps you should try some spelling variations:
thien van » thi van
su triet » su viet, su tien, ve triet
hanh tai » thanh tai, hang tai, han tai
trung va » truong va, trang va, trung ha
su sach » so sach, vu sach
van cam » van nam, van lam, van cau
y nang » ky nang, ly nang, may nang
tuc va » thuc va, truc va, tuc xa
v nang » va nang, vu nang, van nang
tai su » tai so, tai tu, lai 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 (v nang)) xa hoi. thien van cam ((tuc va) or (trung va)) hanh tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) xa hoi. thien van cam ((tuc va) OR (trung va)) hanh tai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (v nang)) xa hoi. thien van cam ((tuc va) or (trung va)) hanh tai su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (v nang)) xa hoi. thien van cam ((tuc va) or (trung va)) hanh tai su triet*.