Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
quoc ban » quoc bao, quoc lan, quoc quan
lanh dai » lanh dao, lanh hai, lang dai
thu sac » thu sach, thu san, thu dac
thu xac » thau xay
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sac) or (thu xac)) ky lang xa hoi. hieu van nam ((quoc ban) or (duc va)) lanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sac) OR (thu xac)) ky lang xa hoi. hieu van nam ((quoc ban) OR (duc va)) lanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sac) or (thu xac)) ky lang xa hoi. hieu van nam ((quoc ban) or (duc va)) lanh dai cua tre*.