Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc anh
lang van » dang van, tang van, hoang van
hanh di » hanh vi, hanh de, hang di
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
hoc cac » hoc cao
van hoi » van hoa, van hoc, van hoe
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
y lang » o lang, _ lang, tay lang
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: ((hoc sach) or (hoc cac)) y lang van hoi. hieu ve cam ((duc van) or (tuc xa)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc cac)) y lang van hoi. hieu ve cam ((duc van) OR (tuc xa)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (hoc cac)) y lang van hoi. hieu ve cam ((duc van) or (tuc xa)) hanh di cua tre*.