Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
van nhanh » van thanh, van hanh, van khanh
tu sach » thu sach, te sach, tu cach
hai cua » thai cua, dai cua, hoi cua
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu va » lieu va, hieu qua
ly nang » ky nang, ly hang, ly vang
lo nang » ho nang, loai nang, cao nang
su sach » so sach, vu 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: ((tu sach) or (su sach)) ((lo nang) OR (ly nang)) xa hoi. hieu va cac duc van nhanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ((lo nang) OR (ly nang)) xa hoi. hieu va cac duc van nhanh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ((lo nang) OR (ly nang)) xa hoi. hieu va cac duc van nhanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ((lo nang) OR (ly nang)) xa hoi. hieu va cac duc van nhanh hai cua te*.