Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van chat » cao chat
tu tieng » luc tieng, tu tuong, tu trong
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
chat tu » nhat tu, chai tu, chay tu
va tinh » may tinh
va dan » ca dan, va dao, va dau
kien » bien, vien, tien

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 ty nang x ho. hieu van chat tu ((va tinh) or (va dan)) ki ((tu tieng) or (su kien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang x ho. hieu van chat tu ((va tinh) OR (va dan)) ki ((tu tieng) OR (su kien)).
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang x ho. hieu van chat tu ((va tinh) or (va dan)) ki ((tu tieng) or (su kien))*.