Perhaps you should try some spelling variations:
dang van » hoang van, hang va
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
di cua » dai cua, doi cua, de cua
ve cam » ve cham, ve cac, va cam

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 ((nang ma) or (dang van)) hoi. hieu ((ve cam) or (va cac)) thuc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang ma) OR (dang van)) hoi. hieu ((ve cam) OR (va cac)) thuc va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang ma) or (dang van)) hoi. hieu ((ve cam) or (va cac)) thuc va hanh di cua tre*.