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