Perhaps you should try some spelling variations:
thanh hat » thanh hai, thanh ha, thanh dat
hoc sach » hoc sinh, hoc cac, hoc anh
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
ca viet » va viet, co viet, hoa viet
sach ky » sac ky, sach y, sach ty
ve cham » va cham, ve chat, vu cham
nang xa » nang x, lang xa, nang ma
hat ca » hat cua, tat ca, hat va
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky nang xa hoi. hieu ((ve cham) or (ve cac)) ((xuc van) or (luc van)) thanh hat ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang xa hoi. hieu ((ve cham) OR (ve cac)) ((xuc van) OR (luc van)) thanh hat ca viet.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang xa hoi. hieu ((ve cham) or (ve cac)) ((xuc van) or (luc van)) thanh hat ca viet*.