Perhaps you should try some spelling variations:
huong doi » huong dan, trong doi, dung doi
vu sach » vu bach, su sach, vu khach
doi cua » dai cua, hoi cua
tuc hat » tuc hai, tu hat, tuc ha
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa

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 ky nang xa hoi. ((hieu va) or (hieu ve)) cam ((tuc va) or (tuc hat)) huong doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. ((hieu va) OR (hieu ve)) cam ((tuc va) OR (tuc hat)) huong doi cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. ((hieu va) or (hieu ve)) cam ((tuc va) or (tuc hat)) huong doi cua tre*.