Perhaps you should try some spelling variations:
thien van » thi van
van phat » va phat, van chat, van phan
phat duc » pham duc, phan duc, phan duoc
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
so sach » bo sach, co sach, hoc sach
so sanh » do sanh
ty nang » ty xang, ty hang, ly nang
duc van » duc va, duc tan, duc manh
cuc te » cua te, cuc thue, cuc tieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (so sanh)) ((ty nang) OR (ky nang)) x ho. thien van phat duc van hanh tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ((ty nang) OR (ky nang)) x ho. thien van phat duc van hanh tai cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) ((ty nang) OR (ky nang)) x ho. thien van phat duc van hanh tai cuc te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) ((ty nang) OR (ky nang)) x ho. thien van phat duc van hanh tai cuc te*.