Perhaps you should try some spelling variations:
lam truoc » lam thuoc, nam truoc, lam truong
than tai » thanh tai, toan tai, nhan tai
truoc va » truc va, thuoc va, truong va
su sach » so sach, vu sach
han tai » hang tai, nhan tai, van tai
sach va » sach xa, sach ha, sach dao
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
ve lam » va lam, de lam, se lam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach va ((nang ma) or (sang ma)) hoi. hieu ve lam truoc va ((han tai) or (than tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach va ((nang ma) OR (sang ma)) hoi. hieu ve lam truoc va ((han tai) OR (than tai)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach va ((nang ma) or (sang ma)) hoi. hieu ve lam truoc va ((han tai) or (than tai)) cuu tre*.