Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc dan, thuc va
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
tang ha » lang ha, tang ma, trung ha
ky tang » ky nang, ky dang, kho tang
tu sach » thu sach, su sach, te sach
ha hoi » hoa hoi, ha noi, xa hoi
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua
tu sac » tu cac, tu san, tu bac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) OR (tu sach)) ky tang ha hoi. hieu ve cam ((thuc van) or (duc van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ky tang ha hoi. hieu ve cam ((thuc van) OR (duc van)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu sach)) ky tang ha hoi. hieu ve cam ((thuc van) or (duc van)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) OR (tu sach)) ky tang ha hoi. hieu ve cam ((thuc van) or (duc van)) hanh vi cua tre*.