Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tru nang » tri nang, thi nang, cuu nang
ban hanh » ban hang
tra nang » thi nang, kha nang, da nang
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
cam cua » ca cua, nam cua, cau cua
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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 ((((tru nang) OR (truc nano))) or (tra nang)) xa hoi. hieu van cam cua ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((((tru nang) OR (truc nano))) OR (tra nang)) xa hoi. hieu van cam cua ban hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((((tru nang) OR (truc nano))) or (tra nang)) xa hoi. hieu van cam cua ban hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((((tru nang) OR (truc nano))) or (tra nang)) xa hoi. hieu van cam cua ban hanh di cua tre*.