Perhaps you should try some spelling variations:
van chat » cao chat
chat tuc » chat xuc, luat tuc, chat huu
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
hoi cua » hoi chuc
doi cua » dai cua, dong cua
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
tuc va » thuc va, truc va, tuc xa
y nang » ky nang, ly nang, v nang

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 (thu hoach)) y nang xa hoi. hieu van chat tuc va thanh ((doi cua) OR (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) y nang xa hoi. hieu van chat tuc va thanh ((doi cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) y nang xa hoi. hieu van chat tuc va thanh ((doi cua) OR (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) y nang xa hoi. hieu van chat tuc va thanh ((doi cua) OR (hoi cua)) tre*.