Perhaps you should try some spelling variations:
thien van » thi van
nang cau » nang cao, hang cau, nang dau
van chat » cao chat
danh tai » doanh tai, dinh tai, hanh tai
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
soc va » loc va, doc va, goc va
tai ve » tai va, tai he, tai le

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 ky nang cau hoi. thien van chat ((soc va) or (hoc va)) danh tai ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cau hoi. thien van chat ((soc va) OR (hoc va)) danh tai ve triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cau hoi. thien van chat ((soc va) or (hoc va)) danh tai ve triet*.