Perhaps you should try some spelling variations:
van hoang » van hoan, quan hoang, tran hoang
thu sach » tu sach, thuat sach, thuoc sach
hoang di » hoang dai, hoang de, hang di
ve triet » su triet
va trien » va truyen, va thiet, va tuyen
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
ve cam » ve cham, ve cac, va cam

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 ky nang xa hoi. hieu ((ve cam) or (va cac)) duc van hoang di ((ve triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ((ve cam) OR (va cac)) duc van hoang di ((ve triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ((ve cam) or (va cac)) duc van hoang di ((ve triet) or (va trien))*.