Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lang hoa » hang hoa, lang ha, nang hoa
cua tre » cuu tre, cua triet, dua tren
da hanh » dao hanh, da thanh, dan hanh
cac tac » cac toc, cac bac, cac dac
van cac » van hac, van cau, van bac
vu sach » vu bach, vu khach
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky lang » ky nang, ky dang, ky tang
su sach » so sach
cua te » cua tu

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)) ky lang hoa hoi. hieu van cac tac da hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky lang hoa hoi. hieu van cac tac da hanh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky lang hoa hoi. hieu van cac tac da hanh vi ((cua tre) or (cua te))*.