Perhaps you should try some spelling variations:
phau hoc » phap hoc, thai hoc, nha hoc
dang xay » dang van, van xay
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
hau loc » huu loc
xay hoi » xa hoi, tay hoi, cay phoi
y dang » ky dang, 2 dang, _ dang
cham o » cham soc

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 y dang xay hoi. hieu ve ((((hau loc) OR (phau hoc))) or (cham o)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y dang xay hoi. hieu ve ((((hau loc) OR (phau hoc))) OR (cham o)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y dang xay hoi. hieu ve ((((hau loc) OR (phau hoc))) or (cham o)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y dang xay hoi. hieu ve ((((hau loc) OR (phau hoc))) or (cham o)) va hanh vai cua tre*.