Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
lanh hai » manh hai, thanh hai, lang chai
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
va lanh » va lang, va danh, va hanh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, su sach, vu khach
da lat » da lam
da lao » da bao, da lam, ha lao

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 (vu sach)) ky nang xa hoi. hieu vien ((da lao) OR (da lat)) va lanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang xa hoi. hieu vien ((da lao) OR (da lat)) va lanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky nang xa hoi. hieu vien ((da lao) OR (da lat)) va lanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang xa hoi. hieu vien ((da lao) OR (da lat)) va lanh hai cua tre*.