Perhaps you should try some spelling variations:
tru nang » tra nang, tri nang, truc nano
hanh tai » thanh tai, hang tai, han tai
vu sach » vu bach, vu khach
su sach » so sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
ve cac » va cac, vien cac
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (su sach)) tru nang xa hoi. hieu ve cac duc va hanh tai cua su~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) tru nang xa hoi. hieu ve cac duc va hanh tai cua su".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) tru nang xa hoi. hieu ve cac duc va hanh tai cua su*.