Perhaps you should try some spelling variations:
hanh sinh » hanh tinh, hanh dinh, hinh sinh
hieu van » hieu va, thien van, lieu va
sinh cuu » dinh cuu, sinh cua, sinh cau
thu sach » thuat sach, thuoc sach, thu hoach
duc van » duc va, duc tan, duc manh
luu van » cuu van, luan van, luu hanh
tu sach » su sach, te sach, tu cach
van cam » van nam, van lam, van cau
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
x hoi » xa hoi, o hoi, x ho

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) OR (thu sach)) ty nang x hoi. hieu van cam ((luu van) or (duc van)) hanh sinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ty nang x hoi. hieu van cam ((luu van) OR (duc van)) hanh sinh cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang x hoi. hieu van cam ((luu van) or (duc van)) hanh sinh cuu tre*".