Perhaps you should try some spelling variations:
trang vai » trang va, trang tai, trang giai
tuan vai » tuan tai, tuan khai, luan van
vu cham » va cham, vu kham, tu cham
soc anh » hoc anh, ngoc anh, nuoc anh
hieu vu » hieu va, hieu ve, hieu su
sach ty » sach tu, sach thu, xach tay
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

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 ty) or (sach y)) nang ma hoi. hieu vu cham soc anh ((tuan vai) OR (trang vai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) nang ma hoi. hieu vu cham soc anh ((tuan vai) OR (trang vai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) nang ma hoi. hieu vu cham soc anh ((tuan vai) OR (trang vai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) nang ma hoi. hieu vu cham soc anh ((tuan vai) OR (trang vai)) cua tre*.