Perhaps you should try some spelling variations:
tran cong » tran hong, trien cong, tran hoang
thi hanh » thi thanh
van hanh » van thanh, ban hanh, van anh
sach thi » sach thu, sach tai, sach thieu
van tran » van trang, van tranh, van tuan
tu sach » thu sach, su sach, te sach
va danh » va dinh, va hanh, dia danh
thi van » thi lan, thi nang
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau
va hoi » xa hoi, va hoc, va hoa
di cua » dai cua, doi cua, de cua

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 thi hanh va hoi. thi van tran cong ((((va danh) or (va dan))) or (van hanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh va hoi. thi van tran cong ((((va danh) OR (va dan))) OR (van hanh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh va hoi. thi van tran cong ((((va danh) or (va dan))) or (van hanh)) di cua tre*.