Perhaps you should try some spelling variations:
bach khoa » anh khoa
trinh vi » trinh va, trinh ve, trinh viet
sach kho » sach dao, sach nha, sach kem
van hai » van ha, van chat, van hanh
doc lap » duoc lam
van hac » van hoc, van ha, van chat
tang xa » trang xa, tang ma, lang xa
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 kho) or (bach khoa)) tang xa hoi. hieu ((van hac) OR (van hai)) doc lap trinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach kho) OR (bach khoa)) tang xa hoi. hieu ((van hac) OR (van hai)) doc lap trinh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach kho) or (bach khoa)) tang xa hoi. hieu ((van hac) OR (van hai)) doc lap trinh vi cua tre*".