Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
vat hanh » vat thanh, van hanh, va hanh
nam thuc » nam thuoc, am thuc, nam thu
thi van » thi hanh, thi nang
thi lan » thi hanh, thi nang, thi lien
lang xa » dang xay, lang van
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
sach o » sach lo, sac o, sach y
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: thu sach o ((lang xa) or (lang ha)) hoi. ((thi van) or (thi lan)) nam thuc vat hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach o ((lang xa) OR (lang ha)) hoi. ((thi van) OR (thi lan)) nam thuc vat hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach o ((lang xa) or (lang ha)) hoi. ((thi van) or (thi lan)) nam thuc vat hanh vi cua tre*.