Perhaps you should try some spelling variations:
thien van » thi van
su triet » su viet, su tien, ve triet
danh tai » doanh tai, dinh tai, hanh tai
van chat » cao chat
nang cau » nang cao, hang cau, nang dau
su sach » so sach, vu sach
tu sach » thu sach, te sach, tu cach
y nang » ky nang, ly nang, v nang
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
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: ((tu sach) OR (su sach)) y nang cau hoi. thien van chat ((soc va) or (loc va)) danh tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang cau hoi. thien van chat ((soc va) OR (loc va)) danh tai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) y nang cau hoi. thien van chat ((soc va) or (loc va)) danh tai su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) y nang cau hoi. thien van chat ((soc va) or (loc va)) danh tai su triet*.