Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
truc va » trung va
thuc va » thuc dan, thuc day
hanh va » hang va, hanh vi
ma hoi » mai hoi, xa hoi, ma hoa
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. hieu van nam ((((truc va) OR (thuc va))) OR (thuc vat)) hanh va cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoi. hieu van nam ((((truc va) OR (thuc va))) or (thuc vat)) hanh va cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu van nam ((((truc va) OR (thuc va))) or (thuc vat)) hanh va cua te*.