Perhaps you should try some spelling variations:
thien van » thi van
sach tai » sach bai, sach tham, sach dao
lam duoc » nam duoc, luat duoc, lam thuoc
va trinh » van trinh, va tinh, lap trinh
su sach » so sach, vu sach
cong xa » cong xay, cong xua, cong ha
van lam » van nam
duoc va » nuoc va, duc va, duoc ma
di cuu » di cua, dinh cuu
di cau » da cau, diem cau

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 tai cong xa hoi. thien van lam duoc va trinh ((di cuu) OR (di cau)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tai cong xa hoi. thien van lam duoc va trinh ((di cuu) OR (di cau)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach tai cong xa hoi. thien van lam duoc va trinh ((di cuu) OR (di cau)) tre*.